beef roast vs roast

beef roast and roast both are nouns.

Word	Noun	Adjective	Verb	Adverb
beef roast	Yes	No	No	No
roast	Yes	Yes	Yes	No

As nouns, roast is a hypernym of beef roast; that is, roast is a word with a broader meaning than beef roast:

beef roast: cut of beef suitable for roasting
roast: a piece of meat roasted or for roasting and of a size for slicing into more than one portion

Other hypernyms of beef roast include joint.

beef roast (noun)	roast (noun)
cut of beef suitable for roasting	negative criticism
	a piece of meat roasted or for roasting and of a size for slicing into more than one portion

beef roast (adjective)	roast (adjective)
	(meat) cooked by dry heat in an oven

beef roast (verb)	roast (verb)
	cook with dry heat, usually in an oven
	subject to laughter or ridicule