kickoff vs birth

kickoff and birth both are nouns.

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

As nouns, birth is a hyponym of kickoff; that is, birth is a word with a more specific, narrower meaning than kickoff:

Other hyponyms of kickoff include incipience, incipiency, starting point, terminus a quo, threshold.

kickoff (noun)	birth (noun)
(football) a kick from the center of the field to start a football game or to resume it after a score	the event of being born
a start given to contestants	a baby born; an offspring
the time at which something is supposed to begin	the process of giving birth
	the kinship relation of an offspring to the parents
	the time when something begins (especially life)

kickoff (verb)	birth (verb)
	cause to be born