Wilms' tumor vs Wilms tumour

Wilms' tumor and Wilms tumour both are nouns.

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

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

Wilms' tumor and Wilms tumour: 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' tumor include adenomyosarcoma, embryoma of the kidney, nephroblastoma.

Wilms' tumor (noun)	Wilms tumour (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