sea squirt vs ascidian

sea squirt and ascidian both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea squirt	Yes	No	No	No
ascidian	Yes	No	No	No

As nouns, ascidian is a hypernym of sea squirt; that is, ascidian is a word with a broader meaning than sea squirt:

sea squirt: ascidian that can contract its body and eject streams of water
ascidian: minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves

sea squirt (noun)	ascidian (noun)
ascidian that can contract its body and eject streams of water	minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves