kickoff vs place-kicking

kickoff and place-kicking both are nouns.

Word	Noun	Adjective	Verb	Adverb
kickoff	Yes	No	No	No
place-kicking	Yes	No	No	No

As nouns, place-kicking is a hypernym of kickoff; that is, place-kicking 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
place-kicking: (sports) a kick in which the ball is placed on the ground before kicking

Other hypernyms of kickoff include place kick, beginning, commencement, start.

kickoff (noun)	place-kicking (noun)
(football) a kick from the center of the field to start a football game or to resume it after a score	(sports) a kick in which the ball is placed on the ground before kicking
a start given to contestants
the time at which something is supposed to begin