A History of Short Words

From the New York Times Crossword Puzzle

SER

Wed, 30 Aug '23
Title for "Game of Thrones" knights
Sat, 26 Aug '23
Spanish verb that conjugates to "somos" for first-person plural
Wed, 17 May '23
To be, in Havana
Thu, 14 Oct '21
Spanish 101 verb
Tue, 23 Feb '21
To be, in Spanish