| epigenesis | (noun) a geological change in the mineral content of rock after the rock has formed | - |
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| pigeon | (noun) wild and domesticated birds having a heavy body and short legs | - |
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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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| stoolpigeon | (noun) someone acting as an informer or decoy for the police | Synonyms: canary, fink, sneak, sneaker, snitch, snitcher, stool pigeon, stoolie |
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