beginning vs start

beginning and start both are nouns.

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

As nouns, beginning and start are synonyms defined as:

Other synonyms of beginning include commencement.

As nouns, start is a hyponym of beginning; that is, start is a word with a more specific, narrower meaning than beginning:

As nouns, beginning and start are synonyms defined as:

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

beginning (noun)	start (noun)
the act of starting something	the act of starting something
the first part or section of something	a sudden involuntary movement
the event consisting of the start of something	a turn to be a starter (in a game at the beginning)
the place where something begins, where it springs into being	the advantage gained by beginning early (as in a race)
the time at which something is supposed to begin	a signal to begin (as in a race)
	the beginning of anything
	a line indicating the location of the start of a race or a game
	the time at which something is supposed to begin

beginning (adjective)	start (adjective)
serving to begin

beginning (verb)	start (verb)
	take the first step or steps in carrying out an action
	set in motion, cause to start
	play in the starting lineup
	bring into being
	get off the ground
	begin or set in motion
	get going or set in motion
	depart for someplace
	bulge outward
	move or jump suddenly, as if in surprise or alarm
	begin work or acting in a certain capacity, office or job
	begin an event that is implied and limited by the nature or inherent function of the direct object
	have a beginning, in a temporal, spatial, or evaluative sense
	have a beginning characterized in some specified way