touch on vs overhaul

touch on is not a noun while overhaul is a noun.

Word	Noun	Adjective	Verb	Adverb
touch on	No	No	Yes	No
overhaul	Yes	No	Yes	No

touch on (noun)	overhaul (noun)
	periodic maintenance on a car or machine
	the act of improving by renewing and restoring

touch on (verb)	overhaul (verb)
restore by replacing a part or putting together what is torn or broken	make repairs, renovations, revisions or adjustments to
have an effect upon	travel past
refer to or discuss briefly
be relevant to