porterhouse vs porterhouse steak

porterhouse and porterhouse steak both are nouns.

Word	Noun	Adjective	Verb	Adverb
porterhouse	Yes	No	No	No
porterhouse steak	Yes	No	No	No

As nouns, porterhouse and porterhouse steak are synonyms defined as:

porterhouse and porterhouse steak: large steak from the thick end of the short loin containing a T-shaped bone and large piece of tenderloin

porterhouse (noun)	porterhouse steak (noun)
large steak from the thick end of the short loin containing a T-shaped bone and large piece of tenderloin	large steak from the thick end of the short loin containing a T-shaped bone and large piece of tenderloin