loosen vs unscrew

loosen and unscrew both are verbs.

Word	Noun	Adjective	Verb	Adverb
loosen	No	No	Yes	No
unscrew	No	No	Yes	No

As verbs, unscrew is a hyponym of loosen; that is, unscrew is a word with a more specific, narrower meaning than loosen:

Other hyponyms of loosen include relax, unbend, remit, slacken, slack.

loosen (verb)	unscrew (verb)
become loose or looser or less tight	loosen something by unscrewing it
make loose or looser	loosen by turning
make less dense
disentangle and raise the fibers of
cause to become loose
become less severe or strict
make less severe or strict