set off vs highlight

set off is not a noun while highlight is a noun.

Word	Noun	Adjective	Verb	Adverb
set off	No	No	Yes	No
highlight	Yes	No	Yes	No

As verbs, highlight is a hyponym of set off; that is, highlight is a word with a more specific, narrower meaning than set off:

Other hyponyms of set off include pick up, foreground, play up, spotlight, raise.

set off (noun)	highlight (noun)
	an area of lightness in a picture
	the most interesting or memorable part

set off (verb)	highlight (verb)
cause to burst with a violent release of energy	apply a highlighter to one's cheeks or eyebrows in order to make them more prominent
set in motion or cause to begin	move into the foreground to make more visible or prominent
direct attention to, as if by means of contrast
provoke or stir up
put in motion or move to act
depart for someplace
make up for