Pectinibranchia vs animal order

Pectinibranchia and animal order both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pectinibranchia	Yes	No	No	No
animal order	Yes	No	No	No

As nouns, animal order is a hypernym of Pectinibranchia; that is, animal order is a word with a broader meaning than Pectinibranchia:

Pectinibranchia: large order of gastropods comprising univalve mollusks that have a single gill resembling a comb
animal order: the order of animals

Pectinibranchia (noun)	animal order (noun)
large order of gastropods comprising univalve mollusks that have a single gill resembling a comb	the order of animals