kickoff vs send-off

kickoff and send-off both are nouns.

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

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

Other synonyms of kickoff include start-off.

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