fondu vs beef fondue

fondu and beef fondue both are nouns.

Word	Noun	Adjective	Verb	Adverb
fondu	Yes	No	No	No
beef fondue	Yes	No	No	No

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

fondu: cubes of meat or seafood cooked in hot oil and then dipped in any of various sauces
beef fondue: cubes of beef cooked in hot oil and then dipped in various tasty sauces

Other hyponyms of fondu include boeuf fondu bourguignon.

fondu (noun)	beef fondue (noun)
hot cheese or chocolate melted to the consistency of a sauce into which bread or fruits are dipped	cubes of beef cooked in hot oil and then dipped in various tasty sauces
cubes of meat or seafood cooked in hot oil and then dipped in any of various sauces