relax vs loosen up

relax and loosen up both are verbs.

Word	Noun	Adjective	Verb	Adverb
relax	No	No	Yes	No
loosen up	No	No	Yes	No

As verbs, relax and loosen up are synonyms defined as:

Other synonyms of relax include decompress, slow down, unbend, unwind.

As verbs, relax and loosen up are synonyms defined as:

Other synonyms of relax include make relaxed, unlax, unstrain, unwind.

As verbs, relax and loosen up are synonyms defined as:

relax and loosen up: become less tense, less formal, or less restrained, and assume a friendlier manner

relax (verb)	loosen up (verb)
become less tense, rest, or take one's ease	become less tense, rest, or take one's ease
cause to feel relaxed	cause to feel relaxed
make less taut	make one's body limber or suppler by stretching, as if to prepare for strenuous physical activity
become loose or looser or less tight	cause to become unblocked
make less active or fast	become less tense, less formal, or less restrained, and assume a friendlier manner
become less severe or strict
make less severe or strict
become less tense, less formal, or less restrained, and assume a friendlier manner