sense of humor vs sense of humour

sense of humor and sense of humour both are nouns.

Word	Noun	Adjective	Verb	Adverb
sense of humor	Yes	No	No	No
sense of humour	Yes	No	No	No

As nouns, sense of humor and sense of humour are synonyms defined as:

sense of humor and sense of humour: the trait of appreciating (and being able to express) the humorous

Other synonyms of sense of humor include humor, humour.

sense of humor (noun)	sense of humour (noun)
the trait of appreciating (and being able to express) the humorous	the trait of appreciating (and being able to express) the humorous