beef fondue vs fondu

beef fondue and fondu both are nouns.

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

As nouns, fondu is a hypernym of beef fondue; that is, fondu is a word with a broader meaning than beef fondue:

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

Other hypernyms of beef fondue include fondue.

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