involve vs touch on

involve and touch on both are verbs.

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

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

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

involve (verb)	touch on (verb)
make complex or intricate or complicated	restore by replacing a part or putting together what is torn or broken
occupy or engage the interest of	have an effect upon
have as a necessary feature	refer to or discuss briefly
connect closely and often incriminatingly	be relevant to
contain as a part
engage as a participant
require as useful, just, or proper