sand tumor vs neoplasm

sand tumor and neoplasm both are nouns.

Word	Noun	Adjective	Verb	Adverb
sand tumor	Yes	No	No	No
neoplasm	Yes	No	No	No

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

sand tumor: 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 sand tumor include tumor, tumour.

sand tumor (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