crinoid vs comatulid

crinoid and comatulid both are nouns.

Word	Noun	Adjective	Verb	Adverb
crinoid	Yes	Yes	No	No
comatulid	Yes	No	No	No

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

crinoid: primitive echinoderms having five or more feathery arms radiating from a central disk
comatulid: free-swimming stalkless crinoid with ten feathery arms; found on muddy sea bottoms

Other hyponyms of crinoid include sea lily, feather star.

crinoid (noun)	comatulid (noun)
primitive echinoderms having five or more feathery arms radiating from a central disk	free-swimming stalkless crinoid with ten feathery arms; found on muddy sea bottoms

crinoid (adjective)	comatulid (adjective)
of or relating to or belonging to the class Crinoidea