nonmalignant neoplasm vs nonmalignant tumor

nonmalignant neoplasm and nonmalignant tumor both are nouns.

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

As nouns, nonmalignant neoplasm and nonmalignant tumor are synonyms defined as:

nonmalignant neoplasm and nonmalignant tumor: a tumor that is not cancerous

Other synonyms of nonmalignant neoplasm include benign tumor, benign tumour, nonmalignant tumour.

nonmalignant neoplasm (noun)	nonmalignant tumor (noun)
a tumor that is not cancerous	a tumor that is not cancerous