pheochromocytoma vs neoplasm

pheochromocytoma and neoplasm both are nouns.

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

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

pheochromocytoma: a vascular tumor of the adrenal gland; hypersecretion of epinephrine results in intermittent or sustained hypertension
neoplasm: an abnormal new mass of tissue that serves no purpose

Other hypernyms of pheochromocytoma include tumor, tumour.

pheochromocytoma (noun)	neoplasm (noun)
a vascular tumor of the adrenal gland; hypersecretion of epinephrine results in intermittent or sustained hypertension	an abnormal new mass of tissue that serves no purpose