porterhouse steak vs porterhouse

porterhouse steak and porterhouse both are nouns.

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

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

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

porterhouse steak (noun)	porterhouse (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