congener

(noun) a minor chemical constituent that gives a wine or liquor its distinctive character.

(noun) an animal or plant that bears a relationship to another (as related by common descent or by membership in the same genus). Synonyms: relative, congenator, congeneric.

(noun) a whole (a thing or person) of the same kind or category as another. Examples: "Lard was also used, though its congener, butter, was more frequently employed." "The american shopkeeper differs from his european congener."