body odour vs body odor

body odour and body odor both are nouns.

Word	Noun	Adjective	Verb	Adverb
body odour	Yes	No	No	No
body odor	Yes	No	No	No

As nouns, body odour and body odor are synonyms defined as:

body odour and body odor: malodorousness resulting from a failure to bathe

Other synonyms of body odour include B.O..

body odour (noun)	body odor (noun)
malodorousness resulting from a failure to bathe	malodorousness resulting from a failure to bathe