shelf bracket vs bracket

shelf bracket and bracket both are nouns.

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

As nouns, bracket is a hypernym of shelf bracket; that is, bracket is a word with a broader meaning than shelf bracket:

Other hypernyms of shelf bracket include wall bracket.

shelf bracket (noun)	bracket (noun)
a bracket to support a shelf	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