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Topic (plural topics):
Noun: Subject; theme; a category or general area of interest.

Engine (plural engines):
Noun: Middle English, from Old French engin, which is from Latin ingenium meaning 'talent, device'. Ingenium is derived from in- meaning 'in' and gignere meaning 'beget'. Engine originally meant 'ingenuity,cunning' which eventually developed into meaning 'the product of ingenuity, a plot or snare' and 'tool, weapon'.