start-off vs send-off

start-off and send-off both are nouns.

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

As nouns, start-off and send-off are synonyms defined as:

Other synonyms of start-off include kickoff.

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