showtime vs outset

showtime and outset both are nouns.

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

As nouns, showtime and outset are synonyms defined as:

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

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