send-off vs send off

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

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