rubdown vs rub down

rubdown is a noun but rub down is not a noun.

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

rubdown (noun)	rub down (noun)
the act of rubbing down, usually for relaxation or medicinal purposes

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