rollover vs roll over

rollover is a noun but roll over is not a noun.

Word	Noun	Adjective	Verb	Adverb
rollover	Yes	No	No	No
roll over	No	No	Yes	No

rollover (noun)	roll over (noun)
the act of changing the institution that invests your pension plan without incurring a tax penalty

rollover (verb)	roll over (verb)
	make a rolling motion or turn
	re-invest (a previous investment) into a similar fund or security
	negociate to repay a loan at a later date for an additional fee