kickoff vs starting time

kickoff and starting time both are nouns.

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

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

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

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

kickoff (noun)	starting time (noun)
(football) a kick from the center of the field to start a football game or to resume it after a score	the time at which something is supposed to begin
a start given to contestants
the time at which something is supposed to begin