tip off vs tip-off

tip off is not a noun while tip-off is a noun.

Word	Noun	Adjective	Verb	Adverb
tip off	No	No	Yes	No
tip-off	Yes	No	No	No

tip off (noun)	tip-off (noun)
	the act of starting a basketball game with a jump ball
	inside information that something is going to happen

tip off (verb)	tip-off (verb)
give insider information or advise to