beginning vs showtime

beginning and showtime both are nouns.

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

As nouns, beginning and showtime are synonyms defined as:

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

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

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

beginning (adjective)	showtime (adjective)
serving to begin