flavourlessness vs flavorlessness

flavourlessness and flavorlessness both are nouns.

Word	Noun	Adjective	Verb	Adverb
flavourlessness	Yes	No	No	No
flavorlessness	Yes	No	No	No

As nouns, flavourlessness and flavorlessness are synonyms defined as:

Other synonyms of flavourlessness include savorlessness, savourlessness, tastelessness.

flavourlessness (noun)	flavorlessness (noun)
the property of having no flavor	the property of having no flavor