concentrate on vs touch on

concentrate on and touch on both are verbs.

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

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

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

concentrate on (verb)	touch on (verb)
center upon	restore by replacing a part or putting together what is torn or broken
	have an effect upon
	refer to or discuss briefly
	be relevant to