appendicularia vs urochordate

appendicularia and urochordate both are nouns.

Word	Noun	Adjective	Verb	Adverb
appendicularia	Yes	No	No	No
urochordate	Yes	No	No	No

As nouns, urochordate is a hypernym of appendicularia; that is, urochordate is a word with a broader meaning than appendicularia:

appendicularia: free-swimming tadpole-shaped pelagic tunicate resembling larvae of other tunicates
urochordate: primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva

Other hypernyms of appendicularia include tunicate, urochord.

appendicularia (noun)	urochordate (noun)
free-swimming tadpole-shaped pelagic tunicate resembling larvae of other tunicates	primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva