bring up vs touch on

bring up and touch on both are verbs.

Word	Noun	Adjective	Verb	Adverb
bring up	No	No	Yes	No
touch on	No	No	Yes	No

As verbs, touch on is a hyponym of bring up; that is, touch on is a word with a more specific, narrower meaning than bring up:

bring up (verb)	touch on (verb)
cause to load (an operating system) and start the initial processes	restore by replacing a part or putting together what is torn or broken
make reference to	have an effect upon
put forward for consideration or discussion	refer to or discuss briefly
summon into action or bring into existence, often as if by magic	be relevant to
raise from a lower to a higher position
cause to come to a sudden stop
look after a child until it is an adult
promote from a lower position or rank