bracket vs angle iron

bracket and angle iron both are nouns.

Word	Noun	Adjective	Verb	Adverb
bracket	Yes	No	Yes	No
angle iron	Yes	No	No	No

As nouns, angle iron is a hyponym of bracket; that is, angle iron is a word with a more specific, narrower meaning than bracket:

Other hyponyms of bracket include angle bracket, console, corbel, truss, modillion, sconce, shelf bracket.

bracket (noun)	angle iron (noun)
a support projecting from a wall (as to hold a shelf)	an L-shaped metal bracket
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