showtime vs beginning

showtime and beginning both are nouns.

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

As nouns, showtime and beginning are synonyms defined as:

showtime and beginning: the time at which something is supposed to begin

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

showtime (noun)	beginning (noun)
the time at which something is supposed to begin	the act of starting something
	the first part or section of something
	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

showtime (adjective)	beginning (adjective)
	serving to begin