A History of Short Words

From the New York Times Crossword Puzzle

PHD

Mon, 21 Mar '22
Academic's degree
Thu, 17 Mar '22
Many a prof has one
Sun, 6 Feb '22
Goal for many a T.A.
Tue, 16 Nov '21
Many a college prof
Sat, 16 Oct '21
Utmost degree?
Sun, 15 Aug '21
Prof's degree