go on vs ramble on

go on and ramble on both are verbs.

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

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

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

go on (verb)	ramble on (verb)
come to pass	continue talking or writing in a desultory manner
continue talking
start running, functioning, or operating
move forward, also in the metaphorical sense
continue a certain state, condition, or activity