psammoma vs neoplasm

psammoma and neoplasm both are nouns.

Word	Noun	Adjective	Verb	Adverb
psammoma	Yes	No	No	No
neoplasm	Yes	No	No	No

As nouns, neoplasm is a hypernym of psammoma; that is, neoplasm is a word with a broader meaning than psammoma:

psammoma: a tumor derived from fibrous tissue of the meninges or choroid plexus or certain other structures associated with the brain; characterized by sandlike particles
neoplasm: an abnormal new mass of tissue that serves no purpose

Other hypernyms of psammoma include tumor, tumour.

psammoma (noun)	neoplasm (noun)
a tumor derived from fibrous tissue of the meninges or choroid plexus or certain other structures associated with the brain; characterized by sandlike particles	an abnormal new mass of tissue that serves no purpose