broth vs beef stock

broth and beef stock both are nouns.

Word	Noun	Adjective	Verb	Adverb
broth	Yes	No	No	No
beef stock	Yes	No	No	No

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

broth: liquid in which meat and vegetables are simmered; used as a basis for e.g. soups or sauces
beef stock: a stock made with beef

Other hyponyms of broth include liquor, pot likker, pot liquor, beef broth, chicken broth, chicken stock, stock cube.

broth (noun)	beef stock (noun)
a thin soup of meat or fish or vegetable stock	a stock made with beef
liquid in which meat and vegetables are simmered; used as a basis for e.g. soups or sauces