touch up vs retouch

touch up and retouch both are verbs.

Word	Noun	Adjective	Verb	Adverb
touch up	No	No	Yes	No
retouch	No	No	Yes	No

As verbs, touch up and retouch are synonyms defined as:

touch up and retouch: alter so as to produce a more desirable appearance

touch up (verb)	retouch (verb)
alter so as to produce a more desirable appearance	alter so as to produce a more desirable appearance
	give retouches to (hair)