| hollyhock | (noun) any of various tall plants of the genus Alcea; native to the Middle East but widely naturalized and cultivated for its very large variously colored flowers | - |
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| (noun) any of various plants of the genus Althaea; similar to but having smaller flowers than genus Alcea | Synonyms: althaea, althea |
| holmium | (noun) a trivalent metallic element of the rare earth group; occurs together with yttrium; forms highly magnetic compounds | Synonyms: atomic number 67, Ho |
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| holocaust | (noun) an act of mass destruction and loss of life (especially in war or by fire) | - |
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| holocephalan | (noun) fish with high compressed head and a body tapering off into a long tail | Synonyms: holocephalian |
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| holocephalian | (noun) fish with high compressed head and a body tapering off into a long tail | Synonyms: holocephalan |
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| hologram | (noun) the intermediate photograph (or photographic record) that contains information for reproducing a three-dimensional image by holography | Synonyms: holograph |
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| holograph | (noun) the intermediate photograph (or photographic record) that contains information for reproducing a three-dimensional image by holography | Synonyms: hologram |
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| (noun) handwritten book or document | Synonyms: manuscript |
| holography | (noun) the branch of optics that deals with the use of coherent light from a laser in order to make a hologram that can then be used to create a three-dimensional image | - |
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| holometabola | (noun) insects that undergo complete metamorphosis | Synonyms: metabola |
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| holometabolism | (noun) complete metamorphosis in insects | Synonyms: holometaboly |
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| holometaboly | (noun) complete metamorphosis in insects | Synonyms: holometabolism |
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| holonym | (noun) a word that names the whole of which a given word is a part | Synonyms: whole name |
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| holonymy | (noun) the semantic relation that holds between a whole and its parts | Synonyms: whole to part relation |
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| holophyte | (noun) an organism that produces its own food by photosynthesis | - |
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| holothurian | (noun) echinoderm having a flexible sausage-shaped body, tentacles surrounding the mouth and tube feet; free-living mud feeders | Synonyms: sea cucumber |
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| holotype | (noun) the original specimen from which the description of a new species is made | Synonyms: type specimen |
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| holster | (noun) a sheath (usually leather) for carrying a handgun | - |
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| (noun) a belt with loops or slots for carrying small hand tools | - |
| holy | (noun) a sacred place of pilgrimage | Synonyms: holy place, sanctum |
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| holystone | (noun) a soft sandstone used for scrubbing the decks of a ship | - |
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| household | (noun) a social unit living together | Synonyms: family, home, house, menage |
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| householder | (noun) someone who owns a home | Synonyms: homeowner |
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| hypercholesteremia | (noun) the presence of an abnormal amount of cholesterol in the cells and plasma of the blood; associated with the risk of atherosclerosis | Synonyms: hypercholesterolemia |
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| hypercholesterolemia | (noun) the presence of an abnormal amount of cholesterol in the cells and plasma of the blood; associated with the risk of atherosclerosis | Synonyms: hypercholesteremia |
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| immunopathology | (noun) the branch of immunology that deals with pathologies of the immune system | - |
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| jobholder | (noun) an employee who holds a regular job | - |
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| keyhole | (noun) the hole where a key is inserted | - |
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| knothole | (noun) a hole in a board where a knot came out | - |
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| landholder | (noun) a holder or proprietor of land | Synonyms: landowner, property owner |
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| landholding | (noun) a holding in the form of land | - |
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| (noun) ownership of land; the state or fact of owning land | - |
| leasehold | (noun) land or property held under a lease | - |
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| leaseholder | (noun) a tenant who holds a lease | Synonyms: lessee |
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| lithology | (noun) the branch of geology that studies rocks: their origin and formation and mineral composition and classification | Synonyms: petrology |
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| loophole | (noun) a small hole in a fortified wall; for observation or discharging weapons | - |
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| (noun) an ambiguity (especially one in the text of a law or contract) that makes it possible to evade a difficulty or obligation | - |
| manhole | (noun) a hole (usually with a flush cover) through which a person can gain access to an underground structure | - |
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| melancholia | (noun) extreme depression characterized by tearful sadness and irrational fears | - |
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| melancholiac | (noun) someone subject to melancholia | Synonyms: melancholic |
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| melancholic | (noun) someone subject to melancholia | Synonyms: melancholiac |
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| melancholy | (noun) a humor that was once believed to be secreted by the kidneys or spleen and to cause sadness and melancholy | Synonyms: black bile |
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| (noun) a feeling of thoughtful sadness | - |
| (noun) a constitutional tendency to be gloomy and depressed | - |
| menthol | (noun) a lotion containing menthol which gives it the smell of mint | - |
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| (noun) a crystalline compound that has the cool and minty taste and odor that occurs naturally in peppermint oil; used as a flavoring and in medicine to relieve itching, pain, and nasal congestion | - |
| methacholine | (noun) parasympathomimetic drug (trademark Mecholyl) that stimulates secretions and smooth muscle activity | Synonyms: Mecholyl |
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| morphology | (noun) the branch of biology that deals with the structure of animals and plants | - |
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| (noun) studies of the rules for forming admissible words | - |
| (noun) the admissible arrangement of sounds in words | Synonyms: sound structure, syllable structure, word structure |
| (noun) the branch of geology that studies the characteristics and configuration and evolution of rocks and land forms | Synonyms: geomorphology |
| mythologisation | (noun) the restatement of a message as a myth | Synonyms: mythologization |
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| mythologist | (noun) an expert on mythology | - |
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| mythologization | (noun) the restatement of a message as a myth | Synonyms: mythologisation |
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| mythology | (noun) the study of myths | - |
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| (noun) myths collectively; the body of stories associated with a culture or institution or person | - |
| naphthol | (noun) either of two phenols derived from naphthalene | - |
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| nephology | (noun) the branch of meteorology that studies clouds and cloud formation | - |
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| neuropsychology | (noun) the branch of psychology that is concerned with the physiological bases of psychological processes | Synonyms: physiological psychology, psychophysiology |
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| nympholepsy | (noun) a frenzy of emotion; as for something unattainable | - |
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| nympholept | (noun) a person seized by nympholepsy | - |
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| officeholder | (noun) the official who holds an office | Synonyms: incumbent |
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| (noun) someone who is appointed or elected to an office and who holds a position of trust | Synonyms: officer |
| onycholysis | (noun) separation of a nail from its normal attachment to the nail bed | - |
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| ornithologist | (noun) a zoologist who studies birds | Synonyms: bird watcher |
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| ornithology | (noun) the branch of zoology that studies birds | - |
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| palaeopathology | (noun) the study of disease of former times (as inferred from fossil evidence) | Synonyms: paleopathology |
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| palaeornithology | (noun) the paleobiology of birds | Synonyms: paleornithology |
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| paleopathology | (noun) the study of disease of former times (as inferred from fossil evidence) | Synonyms: palaeopathology |
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| paleornithology | (noun) the paleobiology of birds | Synonyms: palaeornithology |
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| parapsychologist | (noun) someone who studies the evidence for such psychological phenomena as psychokinesis and telepathy and clairvoyance | - |
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| parapsychology | (noun) phenomena that appear to contradict physical laws and suggest the possibility of causation by mental processes | Synonyms: psychic phenomena, psychic phenomenon |
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| pathologist | (noun) a doctor who specializes in medical diagnosis | Synonyms: diagnostician |
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| pathology | (noun) the branch of medical science that studies the causes and nature and effects of diseases | - |
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| (noun) any deviation from a healthy or normal condition | - |
| peephole | (noun) a hole (in a door or an oven etc) through which you can peep | Synonyms: eyehole, spyhole |
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| pesthole | (noun) a breeding ground for epidemic disease | - |
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| phospholipid | (noun) any of various compounds composed of fatty acids and phosphoric acid and a nitrogenous base; an important constituent of membranes | - |
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| pigeonhole | (noun) a small compartment | Synonyms: cubbyhole |
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| (noun) a specific (often simplistic) category | - |
| pigeonholing | (noun) a system for classifying things into groups | Synonyms: grouping |
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| pinhole | (noun) a small puncture that might have been made by a pin | - |
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| placeholder | (noun) a symbol in a logical or mathematical expression that can be replaced by the name of any member of specified set | - |
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| (noun) a person authorized to act for another | Synonyms: procurator, proxy |
| plughole | (noun) a hole into which a plug fits (especially a hole where water drains away) | - |
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| policyholder | (noun) a person who holds an insurance policy; usually, the client in whose name an insurance policy is written | - |
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| porkholt | (noun) made of lamb or pork | - |
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| porthole | (noun) a window in a ship or airplane | - |
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| (noun) an opening (in a wall or ship or armored vehicle) for firing through | Synonyms: embrasure, port |
| posthole | (noun) a hole dug in the ground to hold a fence post | Synonyms: post hole |
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| potholder | (noun) an insulated pad for holding hot pots | - |
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| pothole | (noun) a pit or hole produced by wear or weathering (especially in a road surface) | Synonyms: chuckhole |
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| potholer | (noun) a person who explores caves | Synonyms: spelaeologist, speleologist, spelunker |
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| psephologist | (noun) a sociologist who studies election trends | - |
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| psephology | (noun) the branch of sociology that studies election trends (as by opinion polls) | - |
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| psycholinguist | (noun) a person (usually a psychologist but sometimes a linguist) who studies the psychological basis of human language | - |
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| psycholinguistics | (noun) the branch of cognitive psychology that studies the psychological basis of linguistic competence and performance | - |
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| psychologist | (noun) a scientist trained in psychology | - |
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| psychology | (noun) the science of mental life | Synonyms: psychological science |
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| psychopathology | (noun) the branch of medicine dealing with the diagnosis and treatment of mental disorders | Synonyms: psychiatry, psychological medicine |
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| (noun) the branch of psychology concerned with abnormal behavior | Synonyms: abnormal psychology |
| rathole | (noun) a small dirty uncomfortable room | - |
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| (noun) a hole (as in the wall of a building) made by rats | - |
| safehold | (noun) a refuge from attack | - |
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| scholar | (noun) a learned person; someone who by long study has gained mastery in one or more disciplines | Synonyms: bookman, scholarly person |
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| (noun) someone (especially a child) who learns (as from a teacher) or takes up knowledge or beliefs | Synonyms: assimilator, learner, student |
| (noun) a student who holds a scholarship | - |
| scholarship | (noun) profound scholarly knowledge | Synonyms: encyclopaedism, encyclopedism, eruditeness, erudition, learnedness, learning |
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| (noun) financial aid provided to a student on the basis of academic merit | - |
| scholastic | (noun) a person who pays more attention to formal rules and book learning than they merit | Synonyms: bookworm, pedant |
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| scholasticism | (noun) orthodoxy of a scholastic variety | Synonyms: academicism, academism |
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| scholia | (noun) a marginal note written by a scholiast (a commentator on ancient or classical literature) | Synonyms: scholium |
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| scholiast | (noun) a scholar who writes explanatory notes on an author (especially an ancient commentator on a classical author) | - |
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| scholium | (noun) a marginal note written by a scholiast (a commentator on ancient or classical literature) | Synonyms: scholia |
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| shareholder | (noun) someone who holds shares of stock in a corporation | Synonyms: shareowner, stockholder |
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| shareholding | (noun) a holding in the form of shares of corporations | - |
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| shopaholic | (noun) a compulsive shopper | - |
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| sinkhole | (noun) a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof | Synonyms: sink, swallow hole |
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| slaveholder | (noun) someone who holds slaves | Synonyms: slave owner, slaver |
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| slaveholding | (noun) the practice of owning slaves | Synonyms: slavery |
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| smallholder | (noun) a person owning or renting a smallholding | - |
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