chordate vs urochord

chordate and urochord both are nouns.

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

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

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

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

chordate (noun)	urochord (noun)
any animal of the phylum Chordata having a notochord or spinal column	a notochord of a larval tunicate typically confined to the caudal region
	primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva

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