birth vs showtime

birth and showtime both are nouns.

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

As nouns, showtime is a hypernym of birth; that is, showtime is a word with a broader meaning than birth:

Other hypernyms of birth include beginning, commencement, first, get-go, kickoff, offset, outset, start, starting time.

birth (noun)	showtime (noun)
the event of being born	the time at which something is supposed to begin
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)

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