orb-weaver vs arthropod family

orb-weaver and arthropod family both are nouns.

Word	Noun	Adjective	Verb	Adverb
orb-weaver	Yes	No	No	No
arthropod family	Yes	No	No	No

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

orb-weaver (noun)	arthropod family (noun)
spiders that spin orb webs; cosmopolitan in distribution	any of the arthropods