nonmalignant neoplasm vs nonmalignant tumour

nonmalignant neoplasm and nonmalignant tumour both are nouns.

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

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

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

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

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