introduction vs start

introduction and start both are nouns.

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

As nouns, start is a hypernym of introduction; that is, start is a word with a broader meaning than introduction:

Other hypernyms of introduction include beginning, commencement.

As nouns, start is a hypernym of introduction; that is, start is a word with a broader meaning than introduction:

introduction: the act of starting something for the first time; introducing something new
start: the act of starting something

Other hypernyms of introduction include beginning, commencement.

introduction (noun)	start (noun)
the act of putting one thing into another	the act of starting something
the act of beginning something new	a sudden involuntary movement
the act of starting something for the first time; introducing something new	a turn to be a starter (in a game at the beginning)
the first section of a communication	the advantage gained by beginning early (as in a race)
formally making a person known to another or to the public	a signal to begin (as in a race)
a basic or elementary instructional text	the beginning of anything
a new proposal	a line indicating the location of the start of a race or a game
	the time at which something is supposed to begin

introduction (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