rub down vs massage

rub down is not a noun while massage is a noun.

Word	Noun	Adjective	Verb	Adverb
rub down	No	No	Yes	No
massage	Yes	No	Yes	No

As verbs, rub down and massage are synonyms defined as:

rub down and massage: manually manipulate (someone's body), usually for medicinal or relaxation purposes

Other synonyms of rub down include knead.

rub down (noun)	massage (noun)
	kneading and rubbing parts of the body to increase circulation and promote relaxation

rub down (verb)	massage (verb)
wear away	give a massage to
manually manipulate (someone's body), usually for medicinal or relaxation purposes	manually manipulate (someone's body), usually for medicinal or relaxation purposes