rambling vs wandering

rambling is not a noun while wandering is a noun.

Word	Noun	Adjective	Verb	Adverb
rambling	No	Yes	No	No
wandering	Yes	Yes	No	No

As adjectives, rambling and wandering are synonyms defined as:

Other synonyms of rambling include meandering, winding.

rambling (noun)	wandering (noun)
	travelling about without any clear destination

rambling (adjective)	wandering (adjective)
of a path e.g.	of a path e.g.
(of e.g. speech and writing) tending to depart from the main point or cover a wide range of subjects	having no fixed course
spreading out in different directions or distributed irregularly	migratory