knight of the square flag vs knight banneret

knight of the square flag and knight banneret both are nouns.

Word	Noun	Adjective	Verb	Adverb
knight of the square flag	Yes	No	No	No
knight banneret	Yes	No	No	No

As nouns, knight of the square flag and knight banneret are synonyms defined as:

knight of the square flag and knight banneret: a knight honored for valor; entitled to display a square banner and to hold higher command

Other synonyms of knight of the square flag include banneret.

knight of the square flag (noun)	knight banneret (noun)
a knight honored for valor; entitled to display a square banner and to hold higher command	a knight honored for valor; entitled to display a square banner and to hold higher command