| spectacular | (adjective) having a quality that thrusts itself into attention | Synonyms: outstanding, prominent, salient, striking |
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| (adjective) characteristic of spectacles or drama | - |
| (adjective) sensational in appearance or thrilling in effect | Synonyms: dramatic, striking |
| (noun) a lavishly produced performance | - |
| spectacularly | (adverb) in a spectacular manner | Synonyms: stunningly |
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| spectate | (verb) be a spectator in a sports event | - |
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| spectator | (noun) a woman's pump with medium heel; usually in contrasting colors for toe and heel | Synonyms: spectator pump |
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| (noun) a close observer; someone who looks at something (such as an exhibition of some kind) | Synonyms: looker, viewer, watcher, witness |
| specter | (noun) a mental representation of some haunting experience | Synonyms: ghost, shade, spectre, spook, wraith |
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| (noun) a ghostly appearing figure | Synonyms: apparition, fantasm, phantasm, phantasma, phantom, spectre |
| spectinomycin | (noun) an antibiotic used to treat gonorrhea | - |
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| spectral | (adjective) of or relating to a spectrum | - |
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| (adjective) resembling or characteristic of a phantom | Synonyms: apparitional, ghostlike, ghostly, phantasmal, spiritual |
| spectrality | (noun) Quality of being spectral or ghostly. | - |
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| spectre | (noun) a mental representation of some haunting experience | Synonyms: ghost, shade, specter, spook, wraith |
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| (noun) a ghostly appearing figure | Synonyms: apparition, fantasm, phantasm, phantasma, phantom, specter |
| spectrogram | (noun) a photographic record of a spectrum | Synonyms: spectrograph |
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| spectrograph | (noun) a spectroscope by which spectra can be photographed | - |
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| (noun) a photographic record of a spectrum | Synonyms: spectrogram |
| spectrographic | (adjective) relating to or employing a spectrograph | - |
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| spectrographically | (adverb) by spectrographic means | - |
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| spectrometer | (noun) spectroscope for obtaining a mass spectrum by deflecting ions into a thin slit and measuring the ion current with an electrometer | Synonyms: mass spectrometer |
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| spectrometric | (adjective) of or relating to or involving spectrometry | - |
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| spectrometry | (noun) the use of spectroscopes to analyze spectra | Synonyms: spectrographic analysis, spectroscopic analysis, spectroscopy, spectrum analysis |
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| spectrophotometer | (noun) a photometer for comparing two light radiations wavelength by wavelength | - |
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| spectroscope | (noun) an optical instrument for spectrographic analysis | Synonyms: prism spectroscope |
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| spectroscopic | (adjective) of or relating to or involving spectroscopy | Synonyms: spectroscopical |
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| spectroscopical | (adjective) of or relating to or involving spectroscopy | Synonyms: spectroscopic |
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| spectroscopy | (noun) the use of spectroscopes to analyze spectra | Synonyms: spectrographic analysis, spectrometry, spectroscopic analysis, spectrum analysis |
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| spectrum | (noun) a broad range of related objects or values or qualities or ideas or activities | - |
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| (noun) an ordered array of the components of an emission or wave | - |
| specular | (adjective) capable of reflecting light like a mirror | Synonyms: mirrorlike |
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| speculate | (verb) reflect deeply on a subject | Synonyms: chew over, contemplate, excogitate, meditate, mull, mull over, muse, ponder, reflect, ruminate, think over |
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| (verb) to believe especially on uncertain or tentative grounds | Synonyms: conjecture, hypothecate, hypothesise, hypothesize, suppose, theorise, theorize |
| (verb) talk over conjecturally, or review in an idle or casual way and with an element of doubt or without sufficient reason to reach a conclusion | - |
| (verb) invest at a risk | Synonyms: job |
| speculation | (noun) a hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence) | Synonyms: conjecture |
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| (noun) continuous and profound contemplation or musing on a subject or series of subjects of a deep or abstruse nature | Synonyms: meditation |
| (noun) a message expressing an opinion based on incomplete evidence | Synonyms: conjecture, guess, hypothesis, supposition, surmisal, surmise |
| (noun) an investment that is very risky but could yield great profits | Synonyms: venture |
| speculative | (adjective) showing curiosity | Synonyms: inquisitive, questioning, wondering |
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| (adjective) not based on fact or investigation | Synonyms: notional |
| (adjective) not financially safe or secure | Synonyms: bad, high-risk, risky |
| speculatively | (adverb) with speculation; in a speculative manner | - |
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| speculativeness | (noun) the quality of being a conclusion or opinion based on supposition and conjecture rather than on fact or investigation | - |
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| (noun) financial risk | - |
| speculator | (noun) someone who risks losses for the possibility of considerable gains | Synonyms: plunger |
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| (noun) someone who makes conjectures without knowing the facts | - |
| speculum | (noun) a medical instrument for dilating a bodily passage or cavity in order to examine the interior | - |
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| (noun) a mirror (especially one made of polished metal) for use in an optical instrument | - |
| subspecies | (noun) (biology) a taxonomic group that is a division of a species; usually arises as a consequence of geographical isolation within a species | Synonyms: race |
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| suspect | (adjective) not as expected | Synonyms: fishy, funny, shady, suspicious |
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| (noun) someone who is under suspicion | - |
| (noun) a person or institution against whom an action is brought in a court of law; the person being sued or accused | Synonyms: defendant |
| (verb) regard as untrustworthy; regard with suspicion; have no faith or confidence in | Synonyms: distrust, mistrust |
| (verb) imagine to be the case or true or probable | Synonyms: surmise |
| (verb) hold in suspicion; believe to be guilty | - |
| suspected | (adjective) believed likely | - |
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| unrespectability | (noun) dishonorableness by virtue of lacking respectability or a good reputation | Synonyms: disreputability, disreputableness |
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| unrespectable | (adjective) unworthy of respect | - |
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| unspecialised | (adjective) not specialized or modified for a particular purpose or function | Synonyms: unspecialized |
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| unspecialized | (adjective) not specialized or modified for a particular purpose or function | Synonyms: unspecialised |
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| unspecific | (adjective) not detailed or specific | Synonyms: broad |
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| unspecified | (adjective) not stated explicitly or in detail | - |
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| unspectacular | (adjective) not spectacular | - |
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| unsuspected | (adjective) not suspected or believed likely | - |
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| unsuspecting | (adjective) not suspicious | Synonyms: unsuspicious |
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| (adjective) (often followed by `of') not knowing or expecting; not thinking likely | - |
| unsuspectingly | (adverb) without suspicions | - |
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