Heterosomata vs animal order

Heterosomata and animal order both are nouns.

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

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

Heterosomata: flatfishes: halibut; sole; flounder; plaice; turbot; tonguefishes
animal order: the order of animals

Heterosomata (noun)	animal order (noun)
flatfishes: halibut; sole; flounder; plaice; turbot; tonguefishes	the order of animals