take off vs start

take off is not a noun while start is a noun.

Word	Noun	Adjective	Verb	Adverb
take off	No	No	Yes	No
start	Yes	No	Yes	No

As verbs, take off and start are synonyms defined as:

Other synonyms of take off include depart, part, set forth, set off, set out, start out.

As verbs, start is a hypernym of take off; that is, start is a word with a broader meaning than take off:

Other hypernyms of take off include get going, go.

As verbs, start is a hypernym of take off; that is, start is a word with a broader meaning than take off:

Other hypernyms of take off include depart, part, set forth, set off, set out, start out, take off.

take off (noun)	start (noun)
	the act of starting something
	a sudden involuntary movement
	a turn to be a starter (in a game at the beginning)
	the advantage gained by beginning early (as in a race)
	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

take off (verb)	start (verb)
remove clothes or shoes	take the first step or steps in carrying out an action
take away	set in motion, cause to start
make a subtraction	play in the starting lineup
prove fatal	bring into being
mimic or imitate in an amusing or satirical manner	get off the ground
depart for someplace	begin or set in motion
get started or set in motion, used figuratively	get going or set in motion
depart from the ground	depart for someplace
take time off from work; stop working temporarily	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