malodorousness vs stinkiness

malodorousness and stinkiness both are nouns.

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

As nouns, malodorousness and stinkiness are synonyms defined as:

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

Other synonyms of malodorousness include fetidness, foulness, rankness.

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