go on vs ramble

go on is not a noun while ramble is a noun.

Word	Noun	Adjective	Verb	Adverb
go on	No	No	Yes	No
ramble	Yes	No	Yes	No

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

Other hyponyms of go on include segue, jog, ramble on.

go on (noun)	ramble (noun)
	an aimless amble on a winding course

go on (verb)	ramble (verb)
come to pass	move about aimlessly or without any destination, often in search of food or employment
continue talking	continue talking or writing in a desultory manner
start running, functioning, or operating
move forward, also in the metaphorical sense
continue a certain state, condition, or activity