Wilms tumour vs Wilms' tumor

Wilms tumour and Wilms' tumor both are nouns.

Word	Noun	Adjective	Verb	Adverb
Wilms tumour	Yes	No	No	No
Wilms' tumor	Yes	No	No	No

As nouns, Wilms tumour and Wilms' tumor are synonyms defined as:

Wilms tumour and Wilms' tumor: malignant renal tumor of young children characterized by hypertension and blood in the urine and the presence of a palpable mass

Other synonyms of Wilms tumour include adenomyosarcoma, embryoma of the kidney, nephroblastoma.

Wilms tumour (noun)	Wilms' tumor (noun)
malignant renal tumor of young children characterized by hypertension and blood in the urine and the presence of a palpable mass	malignant renal tumor of young children characterized by hypertension and blood in the urine and the presence of a palpable mass