rinse off vs scour

rinse off is not a noun while scour is a noun.

Word	Noun	Adjective	Verb	Adverb
rinse off	No	No	Yes	No
scour	Yes	No	Yes	No

As verbs, scour is a hyponym of rinse off; that is, scour is a word with a more specific, narrower meaning than rinse off:

Other hyponyms of rinse off include flush, purge.

rinse off (noun)	scour (noun)
	a place that is scoured (especially by running water)

rinse off (verb)	scour (verb)
wash off soap or remaining dirt	rinse, clean, or empty with a liquid
	rub hard or scrub
	clean with hard rubbing
	examine minutely