fetidness vs malodorousness

fetidness and malodorousness both are nouns.

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

As nouns, fetidness and malodorousness are synonyms defined as:

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

Other synonyms of fetidness include foulness, rankness, stinkiness.

fetidness (noun)	malodorousness (noun)
the attribute of having a strong offensive smell	the attribute of having a strong offensive smell