process cheese vs processed cheese

process cheese and processed cheese both are nouns.

Word	Noun	Adjective	Verb	Adverb
process cheese	Yes	No	No	No
processed cheese	Yes	No	No	No

As nouns, process cheese and processed cheese are synonyms defined as:

process cheese and processed cheese: made by blending several lots of cheese

process cheese (noun)	processed cheese (noun)
made by blending several lots of cheese	made by blending several lots of cheese