beef vs corned beef

beef and corned beef both are nouns.

Word	Noun	Adjective	Verb	Adverb
beef	Yes	No	Yes	No
corned beef	Yes	No	No	No

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

Other hyponyms of beef include ground beef, hamburger, bully beef, corn beef, pastrami.

beef (noun)	corned beef (noun)
cattle that are reared for their meat	beef cured or pickled in brine
informal terms for objecting
meat from an adult domestic bovine

beef (verb)	corned beef (verb)
complain