“Tumor” or “Tumour”—What's the difference?

Usage by country

Where each spelling is used

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

Usage level out of 100 (if available).
Country	tumor	tumour	Preference
United States	99	1	“tumor”
United Kingdom	53	47	“tumor”
India	86	14	“tumor”
Philippines	99	1	“tumor”
Canada	81	19	“tumor”
Australia	57	43	“tumor”
Liberia	100	0	“tumor”
Ireland	57	43	“tumor”
New Zealand	59	41	“tumor”
Jamaica	87	13	“tumor”
Trinidad & Tobago	85	15	“tumor”
Guyana	100	0	“tumor”

Usage

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

This tumor should not be confused with…
…properties causing syncytia formations of tumor cells, which, apart from amplifying…
After the tumor returned in 2005, he was…
Treg activity in tumor immunity
…a recurrence of his brain tumor.
p53 is a tumor suppressor protein encoded by the…
…was responsible for inhibition of tumor induced angiogenesis and could prevent…
…in radiation therapy resistance and tumor progression, possibly via over-expression of
…Mayor of Hamburg (1988–1997), brain tumor.
…usually paraganglioma refer to a tumor originating from chromaffin cells outside…

…career until 1940, but the tumour returned to cause his death…
…campaigns (named as 'Artery', 'Lung', 'Tumour', 'Brain', 'Eye' and 'Tar') between…
…that suggest that e-cigarettes promote tumour growth in human cells."
In osteolytic bone metastases, tumour cells migrate to the bone…
…tumor, involved in devil facial tumour disease, appears to be recognized…
…diagnosed with an aggressive brain tumour, and returned to his native…
…been suffering from a brain tumour.
…proliferation at the time of tumour antigen recognition.
…lung overload, inflammation and ultimately tumour formation, not to exposure to…
…hospital, Cheryl questions whether his tumour has been affected by this,…

Examples are Wikipedia snippets under the CC ShareAlike 3.0 license.

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