coffee fungus vs fungus

coffee fungus and fungus both are nouns.

Word	Noun	Adjective	Verb	Adverb
coffee fungus	Yes	No	No	No
fungus	Yes	No	No	No

As nouns, fungus is a hypernym of coffee fungus; that is, fungus is a word with a broader meaning than coffee fungus:

coffee fungus: fungus causing a disease in coffee and some other tropical plants
fungus: an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia

coffee fungus (noun)	fungus (noun)
fungus causing a disease in coffee and some other tropical plants	an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia