Theridiidae vs arthropod family

Theridiidae and arthropod family both are nouns.

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

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

Theridiidae (noun)	arthropod family (noun)
a family of comb-footed spiders	any of the arthropods