Tumor
Part of speech: noun
Definition: An abnormal growth; differential diagnosis includes abscess, metaplasia, and neoplasia.
Example sentence: Cancer is like the common cold; there are so many different types. In the future we'll still have cancer, but we'll detect it very, very early, so that it won't kill anybody. We'll zap it at the molecular level decades before it grows into a tumor.
Tumour
Part of speech: noun
Definition: An abnormal growth; differential diagnosis includes abscess, metaplasia, and neoplasia.