showtime vs birth

showtime and birth both are nouns.

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

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

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

showtime (noun)	birth (noun)
the time at which something is supposed to begin	the event of being born
	a baby born; an offspring
	the process of giving birth
	the kinship relation of an offspring to the parents
	the time when something begins (especially life)

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