send-off vs kickoff

send-off and kickoff both are nouns.

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

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

Other synonyms of send-off include start-off.

send-off (noun)	kickoff (noun)
an organized expression of goodwill at the start of a trip or new venture	(football) a kick from the center of the field to start a football game or to resume it after a score
a start given to contestants	a start given to contestants
	the time at which something is supposed to begin