tunicate vs larvacean

tunicate and larvacean both are nouns.

Word	Noun	Adjective	Verb	Adverb
tunicate	Yes	No	No	No
larvacean	Yes	No	No	No

As nouns, larvacean is a hyponym of tunicate; that is, larvacean is a word with a more specific, narrower meaning than tunicate:

tunicate: primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva
larvacean: any member of the class Larvacea

Other hyponyms of tunicate include ascidian, salp, salpa, doliolum, appendicularia.

tunicate (noun)	larvacean (noun)
primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva	any member of the class Larvacea