Dictionary.com
Thesaurus.com

hyponymy

American  
[hahy-pon-uh-mee] / haɪˈpɒn ə mi /

noun

Linguistics.
  1. the state or quality of being a hyponym, a term that denotes a subcategory of a more general class.

    A relationship of hyponymy exists between “dog” and “animal.”


Etymology

Origin of hyponymy

1950–55; hyp- + -onymy ( -onym, -y 3 ), on the model of homonymy, synonymy