domesticated animal vs beast

domesticated animal and beast both are nouns.

Word	Noun	Adjective	Verb	Adverb
domesticated animal	Yes	No	No	No
beast	Yes	No	No	No

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

domesticated animal: any of various animals that have been tamed and made fit for a human environment
beast: a living organism characterized by voluntary movement

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

domesticated animal (noun)	beast (noun)
any of various animals that have been tamed and made fit for a human environment	a living organism characterized by voluntary movement
	a cruelly rapacious person