square bracket vs bracket

square bracket and bracket both are nouns.

Word	Noun	Adjective	Verb	Adverb
square bracket	Yes	No	No	No
bracket	Yes	No	Yes	No

As nouns, square bracket and bracket are synonyms defined as:

square bracket and bracket: either of two punctuation marks ([ or ]) used to enclose textual material

square bracket (noun)	bracket (noun)
either of two punctuation marks ([ or ]) used to enclose textual material	a support projecting from a wall (as to hold a shelf)
	either of two punctuation marks ([ or ]) used to enclose textual material
	either of two punctuation marks (`<' or `>') used in computer programming and sometimes used to enclose textual material
	a category falling within certain defined limits