touch on vs cobble

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

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

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

touch on: restore by replacing a part or putting together what is torn or broken
cobble: repair or mend

touch on (noun)	cobble (noun)
	rectangular paving stone with curved top; once used to make roads

touch on (verb)	cobble (verb)
restore by replacing a part or putting together what is torn or broken	repair or mend
have an effect upon	pave with cobblestones
refer to or discuss briefly
be relevant to