free-swimming vs unattached

free-swimming and unattached both are adjectives.

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

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

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

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