Tumour has 2 different meanings across 1 category:
Noun
an abnormal new mass of tissue that serves no purpose
"The doctors found a small, non-cancerous tumour on her liver during the routine ultrasound."
An abnormal growth; differential diagnosis includes abscess, metaplasia, and neoplasia.
"The doctor ordered an MRI to determine whether the lump in his lung was a benign tumour or something more serious like an abscess."