ramble vs roam

ramble is a noun but roam is not a noun.

Word	Noun	Adjective	Verb	Adverb
ramble	Yes	No	Yes	No
roam	No	No	Yes	No

As verbs, ramble and roam are synonyms defined as:

ramble and roam: move about aimlessly or without any destination, often in search of food or employment

Other synonyms of ramble include cast, drift, range, roll, rove, stray, swan, tramp, vagabond, wander.

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

ramble (verb)	roam (verb)
move about aimlessly or without any destination, often in search of food or employment	move about aimlessly or without any destination, often in search of food or employment
continue talking or writing in a desultory manner