peppered steak vs steak au poivre

peppered steak and steak au poivre both are nouns.

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

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

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

Other synonyms of peppered steak include pepper steak.

peppered steak (noun)	steak au poivre (noun)
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