peppered steak vs pepper steak

peppered steak and pepper steak both are nouns.

Word	Noun	Adjective	Verb	Adverb
peppered steak	Yes	No	No	No
pepper steak	Yes	No	No	No

As nouns, peppered steak and pepper steak are synonyms defined as:

peppered steak and pepper steak: steak covered with crushed peppercorns pan-broiled and served with brandy-and-butter sauce

Other synonyms of peppered steak include steak au poivre.

peppered steak (noun)	pepper steak (noun)
steak covered with crushed peppercorns pan-broiled and served with brandy-and-butter sauce	strips of steak sauteed with green peppers and onions
	steak covered with crushed peppercorns pan-broiled and served with brandy-and-butter sauce