benign tumour vs tumour

benign tumour and tumour both are nouns.

Word	Noun	Adjective	Verb	Adverb
benign tumour	Yes	No	No	No
tumour	Yes	No	No	No

As nouns, tumour is a hypernym of benign tumour; that is, tumour is a word with a broader meaning than benign tumour:

Other hypernyms of benign tumour include neoplasm, tumor.

benign tumour (noun)	tumour (noun)
a tumor that is not cancerous	an abnormal new mass of tissue that serves no purpose