vitreous humor vs vitreous humour

vitreous humor and vitreous humour both are nouns.

Word	Noun	Adjective	Verb	Adverb
vitreous humor	Yes	No	No	No
vitreous humour	Yes	No	No	No

As nouns, vitreous humor and vitreous humour are synonyms defined as:

vitreous humor and vitreous humour: the clear colorless transparent jelly that fills the posterior chamber of the eyeball

Other synonyms of vitreous humor include vitreous body.

vitreous humor (noun)	vitreous humour (noun)
the clear colorless transparent jelly that fills the posterior chamber of the eyeball	the clear colorless transparent jelly that fills the posterior chamber of the eyeball