outset vs showtime

outset and showtime both are nouns.

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

As nouns, outset and showtime are synonyms defined as:

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

outset (noun)	showtime (noun)
the time at which something is supposed to begin	the time at which something is supposed to begin