starting time vs beginning

starting time and beginning both are nouns.

Word	Noun	Adjective	Verb	Adverb
starting time	Yes	No	No	No
beginning	Yes	Yes	No	No

As nouns, starting time and beginning are synonyms defined as:

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

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

starting time (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

starting time (adjective)	beginning (adjective)
	serving to begin