tastelessness vs flavorlessness

tastelessness and flavorlessness both are nouns.

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

As nouns, tastelessness and flavorlessness are synonyms defined as:

Other synonyms of tastelessness include flavourlessness, savorlessness, savourlessness.

tastelessness (noun)	flavorlessness (noun)
inelegance indicated by a lack of good taste	the property of having no flavor
the property of having no flavor