standing rib roast vs rib roast

standing rib roast and rib roast both are nouns.

Word	Noun	Adjective	Verb	Adverb
standing rib roast	Yes	No	No	No
rib roast	Yes	No	No	No

As nouns, standing rib roast and rib roast are synonyms defined as:

standing rib roast and rib roast: a cut of meat (beef or venison) including more than one rib and the meat located along the outside of the ribs

standing rib roast (noun)	rib roast (noun)
a cut of meat (beef or venison) including more than one rib and the meat located along the outside of the ribs	a cut of meat (beef or venison) including more than one rib and the meat located along the outside of the ribs