rankness vs fetidness

rankness and fetidness both are nouns.

Word	Noun	Adjective	Verb	Adverb
rankness	Yes	No	No	No
fetidness	Yes	No	No	No

As nouns, rankness and fetidness are synonyms defined as:

rankness and fetidness: the attribute of having a strong offensive smell

Other synonyms of rankness include foulness, malodorousness, stinkiness.

rankness (noun)	fetidness (noun)
the attribute of having a strong offensive smell	the attribute of having a strong offensive smell
the property of producing abundantly and sustaining vigorous and luxuriant growth