starting time vs kickoff

starting time and kickoff both are nouns.

Word	Noun	Adjective	Verb	Adverb
starting time	Yes	No	No	No
kickoff	Yes	No	No	No

As nouns, starting time and kickoff are synonyms defined as:

starting time and kickoff: the time at which something is supposed to begin

Other synonyms of starting time include beginning, commencement, first, get-go, offset, outset, showtime, start.

starting time (noun)	kickoff (noun)
the time at which something is supposed to begin	(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
	the time at which something is supposed to begin