acervulus vs fruiting body

acervulus and fruiting body both are nouns.

Word	Noun	Adjective	Verb	Adverb
acervulus	Yes	No	No	No
fruiting body	Yes	No	No	No

As nouns, fruiting body is a hypernym of acervulus; that is, fruiting body is a word with a broader meaning than acervulus:

acervulus: small asexual fruiting body resembling a cushion or blister consisting of a mat of hyphae that is produced on a host by some fungi
fruiting body: an organ specialized for producing spores

acervulus (noun)	fruiting body (noun)
small asexual fruiting body resembling a cushion or blister consisting of a mat of hyphae that is produced on a host by some fungi	an organ specialized for producing spores