stinkiness vs malodorousness

stinkiness and malodorousness both are nouns.

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

As nouns, stinkiness and malodorousness are synonyms defined as:

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

Other synonyms of stinkiness include fetidness, foulness, rankness.

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