carry-over vs carry over

carry-over is a noun but carry over is not a noun.

Word	Noun	Adjective	Verb	Adverb
carry-over	Yes	No	No	No
carry over	No	No	Yes	No

carry-over (noun)	carry over (noun)
application of a skill learned in one situation to a different but similar situation
the accumulated and undivided profits of a corporation after provision has been made for dividends and reserves

carry-over (verb)	carry over (verb)
	transfer or persist from one stage or sphere of activity to another
	transfer from one time period to the next
	transport from one place or state to another
	hold over goods to be sold for the next season