bracket vs square bracket

bracket and square bracket both are nouns.

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

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

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

bracket (noun)	square bracket (noun)
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 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