knight banneret vs knight of the square flag

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

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

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

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

Other synonyms of knight banneret include banneret.

knight banneret (noun)	knight of the square flag (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