brute vs free-swimming

brute is a noun but free-swimming is not a noun.

Word	Noun	Adjective	Verb	Adverb
brute	Yes	Yes	No	No
free-swimming	No	Yes	No	No

brute (noun)	free-swimming (noun)
a living organism characterized by voluntary movement
a cruelly rapacious person

brute (adjective)	free-swimming (adjective)
resembling a beast; showing lack of human sensibility	(of animals) able to swim about; not attached