“Tumors” or “Tumours”—What's the difference?

Usage by country

Where each spelling is used

Of the 12 countries below, 10 prefer “tumors” and 0 prefer “tumours”. Usage levels are out of 100; the more common spelling in each country is in bold.

Usage level out of 100 (if available).
Country	tumors	tumours	Preference
United States	99	1	“tumors”
United Kingdom	52	48	“tumors”
India	84	16	“tumors”
Philippines	96	4	“tumors”
Canada	81	19	“tumors”
Australia	58	42	“tumors”
Liberia	0	0	Not enough data
Ireland	62	38	“tumors”
New Zealand	60	40	“tumors”
Jamaica	100	0	“tumors”
Trinidad & Tobago	85	15	“tumors”
Guyana	0	0	Not enough data

Usage

Examples in context

Real sentences for each spelling. Hover an example to copy it.

“tumors”

…but abnormal areas (e.g., scars, tumors) do not.
…to remove bladder stones or tumors.
…to remove peptic ulcers or tumors might also be considered.
…to nerves is common in tumors of abdominal and urogenital hollow
Hormone-secreting tumors: some hormones, e.g.
…viral infection, parasites, gallstone, or tumors may also cause the blockage.
…rarity of this condition, these tumors constitute 16% of the pituitary…
…Kaposi's sarcoma, keratoacanthoma, spindle cell tumors, sebaceous carcinomas, microcystic adnexal carcinoma,…
…able to demonstrate clonality of tumors in human females using an…
Analyses of many tumors typically found in humans including…

“tumours”

…showed a decreased number of tumours) and no identified mechanism for…
Solid pseudopapillary tumours are typically round, well-demarcated, measuring…
…18 percent of colorectal cancer tumours have MMR deficiencies, with 3…
…with a variety of subcutaneous tumours.
…a "complete eradication of established tumours in 60% of mice".
…particularly pulmonary tuberculosis and lung tumours.
Solid pseudopapillary tumours are often asymptomatic, and are…
…context of leukaemias or solid tumours.
PEN tumours are always painless, solid masses…
Inflammatory myofibroblastic tumours are characterized by a mix…

Examples are Wikipedia snippets under the CC ShareAlike 3.0 license.

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