ectotherm vs beast

ectotherm and beast both are nouns.

Word	Noun	Adjective	Verb	Adverb
ectotherm	Yes	No	No	No
beast	Yes	No	No	No

As nouns, beast is a hypernym of ectotherm; that is, beast is a word with a broader meaning than ectotherm:

ectotherm: an animal whose body temperature varies with the temperature of its surroundings; any animal except birds and mammals
beast: a living organism characterized by voluntary movement

Other hypernyms of ectotherm include animal, animate being, brute, creature, fauna.

ectotherm (noun)	beast (noun)
an animal whose body temperature varies with the temperature of its surroundings; any animal except birds and mammals	a living organism characterized by voluntary movement
	a cruelly rapacious person