homeothermic vs homeotherm

homeothermic is not a noun while homeotherm is a noun.

Word	Noun	Adjective	Verb	Adverb
homeothermic	No	Yes	No	No
homeotherm	Yes	No	No	No

homeothermic (noun)	homeotherm (noun)
	an animal that has a body temperature that is relatively constant and independent of the environmental temperature

homeothermic (adjective)	homeotherm (adjective)
of birds and mammals; having constant and relatively high body temperature