send off vs send-off

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

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

send off (noun)	send-off (noun)
	an organized expression of goodwill at the start of a trip or new venture
	a start given to contestants

send off (verb)	send-off (verb)
transfer
throw, send, or cast forward
send away towards a designated goal