clamor vs clamour

clamor and clamour both are nouns.

Word	Noun	Adjective	Verb	Adverb
clamor	Yes	No	Yes	No
clamour	Yes	No	Yes	No

As nouns, clamor and clamour are synonyms defined as:

Other synonyms of clamor include clamoring, clamouring, hue and cry.

As verbs, clamor and clamour are synonyms defined as:

As verbs, clamor and clamour are synonyms defined as:

clamor (noun)	clamour (noun)
loud and persistent outcry from many people	loud and persistent outcry from many people
a loud harsh or strident noise

clamor (verb)	clamour (verb)
utter or proclaim insistently and noisily	utter or proclaim insistently and noisily
make loud demands	make loud demands
compel someone to do something by insistent clamoring