aimless vs drifting

aimless is not a noun while drifting is a noun.

Word	Noun	Adjective	Verb	Adverb
aimless	No	Yes	No	No
drifting	Yes	Yes	No	No

As adjectives, aimless and drifting are synonyms defined as:

aimless and drifting: continually changing especially as from one abode or occupation to another

Other synonyms of aimless include floating, vagabond, vagrant.

aimless (noun)	drifting (noun)
	aimless wandering from place to place

aimless (adjective)	drifting (adjective)
aimlessly drifting	continually changing especially as from one abode or occupation to another
continually changing especially as from one abode or occupation to another