chordate vs urochordate

chordate and urochordate both are nouns.

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

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

chordate: any animal of the phylum Chordata having a notochord or spinal column
urochordate: primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva

Other hyponyms of chordate include cephalochordate, tunicate, urochord, craniate, vertebrate.

chordate (noun)	urochordate (noun)
any animal of the phylum Chordata having a notochord or spinal column	primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva

chordate (adjective)	urochordate (adjective)
of or relating to or characteristic of the Chordata