rub down vs chafe

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

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

As verbs, chafe is a hyponym of rub down; that is, chafe is a word with a more specific, narrower meaning than rub down:

Other hyponyms of rub down include excoriate, rasp.

rub down (noun)	chafe (noun)
	anger produced by some annoying irritation
	soreness and warmth caused by friction

rub down (verb)	chafe (verb)
wear away	warm by rubbing, as with the hands
manually manipulate (someone's body), usually for medicinal or relaxation purposes	tear or wear off the skin or make sore by abrading
	cause friction
	cause annoyance in; disturb, especially by minor irritations
	feel extreme irritation or anger
	become or make sore by or as if by rubbing