Gerridae vs arthropod family

Gerridae and arthropod family both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gerridae	Yes	No	No	No
arthropod family	Yes	No	No	No

As nouns, arthropod family is a hypernym of Gerridae; that is, arthropod family is a word with a broader meaning than Gerridae:

Gerridae (noun)	arthropod family (noun)
an arthropod family that includes water striders	any of the arthropods
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