A History of Short Words

From the New York Times Crossword Puzzle

ISNT

Wed, 1 Dec '21
First word of Sondheim's "Send in the Clowns"
Thu, 4 Nov '21
What separates money from everything?
Tue, 27 Jul '21
Stevie Wonder's "___ She Lovely"
Thu, 25 Feb '21
Lacks existence