pepper steak vs steak au poivre

pepper steak and steak au poivre both are nouns.

Word	Noun	Adjective	Verb	Adverb
pepper steak	Yes	No	No	No
steak au poivre	Yes	No	No	No

As nouns, pepper steak and steak au poivre are synonyms defined as:

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

Other synonyms of pepper steak include peppered steak.

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