A
hyponym is a
word that is conceptually included within the definition of another word, as
scarlet,
vermilion,
carmine and
crimson are all hyponyms of
red. Although closely related in meaning to
synonym, they are two different
semantic categories.
Tulip is a hyponym of
flower, for instance, but not a synonym.
In his classic formulation, the linguist C.E. Bazell stated, "There is a relation of hyponymy when one word may invariable be replaced by a second word, but not vice-versa, without change of meaning."
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