crinoid vs echinoderm

crinoid and echinoderm both are nouns.

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

As nouns, echinoderm is a hypernym of crinoid; that is, echinoderm is a word with a broader meaning than crinoid:

crinoid: primitive echinoderms having five or more feathery arms radiating from a central disk
echinoderm: marine invertebrates with tube feet and five-part radially symmetrical bodies

crinoid (noun)	echinoderm (noun)
primitive echinoderms having five or more feathery arms radiating from a central disk	marine invertebrates with tube feet and five-part radially symmetrical bodies

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