untie vs loosen

untie and loosen both are verbs.

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

As verbs, untie and loosen are synonyms defined as:

Other synonyms of untie include undo.

untie (verb)	loosen (verb)
undo the ties of	become loose or looser or less tight
cause to become loose	make loose or looser
	make less dense
	disentangle and raise the fibers of
	cause to become loose
	become less severe or strict
	make less severe or strict