T-bone steak vs beefsteak

T-bone steak and beefsteak both are nouns.

Word	Noun	Adjective	Verb	Adverb
T-bone steak	Yes	No	No	No
beefsteak	Yes	No	No	No

As nouns, beefsteak is a hypernym of T-bone steak; that is, beefsteak is a word with a broader meaning than T-bone steak:

T-bone steak: small steak from the thin end of the short loin containing a T-shaped bone and small piece of tenderloin
beefsteak: a beef steak usually cooked by broiling

T-bone steak (noun)	beefsteak (noun)
small steak from the thin end of the short loin containing a T-shaped bone and small piece of tenderloin	a beef steak usually cooked by broiling