send-up vs put-on

send-up and put-on both are nouns.

Word	Noun	Adjective	Verb	Adverb
send-up	Yes	No	No	No
put-on	Yes	No	No	No

As nouns, send-up and put-on are synonyms defined as:

send-up and put-on: a composition that imitates or misrepresents somebody's style, usually in a humorous way

Other synonyms of send-up include burlesque, lampoon, mockery, parody, pasquinade, sendup, spoof, takeoff, travesty.

send-up (noun)	put-on (noun)
a composition that imitates or misrepresents somebody's style, usually in a humorous way	something intended to deceive; deliberate trickery intended to gain an advantage
	a ludicrous or grotesque act done for fun and amusement
	a composition that imitates or misrepresents somebody's style, usually in a humorous way