sense of humour vs sense of humor

sense of humour and sense of humor both are nouns.

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

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

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

Other synonyms of sense of humour include humor, humour.

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