kickoff vs beginning

kickoff and beginning both are nouns.

Word	Noun	Adjective	Verb	Adverb
kickoff	Yes	No	No	No
beginning	Yes	Yes	No	No

As nouns, beginning is a hypernym of kickoff; that is, beginning is a word with a broader meaning than kickoff:

kickoff: (football) a kick from the center of the field to start a football game or to resume it after a score
beginning: the act of starting something

Other hypernyms of kickoff include place-kicking, place kick, commencement, start.

As nouns, kickoff and beginning are synonyms defined as:

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

kickoff (noun)	beginning (noun)
(football) a kick from the center of the field to start a football game or to resume it after a score	the act of starting something
a start given to contestants	the first part or section of something
the time at which something is supposed to begin	the event consisting of the start of something
	the place where something begins, where it springs into being
	the time at which something is supposed to begin

kickoff (adjective)	beginning (adjective)
	serving to begin