| amethyst | (noun) a transparent purple variety of quartz; used as a gemstone | - |
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| analyst | (noun) someone who is skilled at analyzing data | - |
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| (noun) a licensed practitioner of psychoanalysis | Synonyms: psychoanalyst |
| (noun) an expert who studies financial data (on credit or securities or sales or financial patterns etc.) and recommends appropriate business actions | - |
| anticatalyst | (noun) (chemistry) a substance that retards a chemical reaction or diminishes the activity of a catalyst | - |
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| biocatalyst | (noun) a biochemical catalyst such as an enzyme | - |
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| blastocyst | (noun) the blastula of a placental mammal in which some differentiation of cells has occurred | Synonyms: blastodermic vessicle |
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| catalyst | (noun) something that causes an important event to happen | - |
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| (noun) (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected | Synonyms: accelerator |
| cryptanalyst | (noun) decoder skilled in the analysis of codes and cryptograms | Synonyms: cryptographer, cryptologist |
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| cyst | (noun) a small anatomically normal sac or bladderlike structure (especially one containing fluid) | Synonyms: vesicle |
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| (noun) a closed sac that develops abnormally in some body structure | - |
| dacryocyst | (noun) either of the two dilated ends of the lacrimal ducts at the nasal ends of the eyes that fill with tears secreted by the lacrimal glands | Synonyms: lacrimal sac, tear sac |
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| hematocyst | (noun) a cyst containing blood | Synonyms: blood cyst, hemorrhagic cyst |
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| psychoanalyst | (noun) a licensed practitioner of psychoanalysis | Synonyms: analyst |
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| tryst | (noun) a secret rendezvous (especially between lovers) | Synonyms: assignation |
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| (noun) a date; usually with a member of the opposite sex | Synonyms: rendezvous |