flavorlessness vs tastelessness

flavorlessness and tastelessness both are nouns.

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

As nouns, flavorlessness and tastelessness are synonyms defined as:

Other synonyms of flavorlessness include flavourlessness, savorlessness, savourlessness.

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