unattached vs free-swimming

unattached and free-swimming both are adjectives.

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

As adjectives, unattached and free-swimming are synonyms defined as:

unattached and free-swimming: (of animals) able to swim about; not attached

unattached (adjective)	free-swimming (adjective)
not associated in an exclusive sexual relationship	(of animals) able to swim about; not attached
not fastened together
(of animals) able to swim about; not attached