wandering vs rambling

wandering is a noun but rambling is not a noun.

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

As adjectives, wandering and rambling are synonyms defined as:

Other synonyms of wandering include meandering, winding.

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

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