affect vs touch on

affect is a noun but touch on is not a noun.

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

As verbs, affect and touch on are synonyms defined as:

Other synonyms of affect include bear on, bear upon, impact, touch.

As verbs, touch on is a hypernym of affect; that is, touch on is a word with a broader meaning than affect:

Other hypernyms of affect include bear on, come to, concern, have to do with, pertain, refer, relate, touch.

affect (noun)	touch on (noun)
the conscious subjective aspect of feeling or emotion

affect (verb)	touch on (verb)
act physically on; have an effect upon	restore by replacing a part or putting together what is torn or broken
have an effect upon	have an effect upon
make believe with the intent to deceive	refer to or discuss briefly
have an emotional or cognitive impact upon	be relevant to
connect closely and often incriminatingly