boeuf vs bully beef

boeuf and bully beef both are nouns.

Word	Noun	Adjective	Verb	Adverb
boeuf	Yes	No	No	No
bully beef	Yes	No	No	No

As nouns, bully beef is a hyponym of boeuf; that is, bully beef is a word with a more specific, narrower meaning than boeuf:

Other hyponyms of boeuf include ground beef, hamburger, corn beef, corned beef, pastrami.

boeuf (noun)	bully beef (noun)
meat from an adult domestic bovine	beef cured or pickled in brine