oiliness vs unctuousness

oiliness and unctuousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
oiliness	Yes	No	No	No
unctuousness	Yes	No	No	No

As nouns, oiliness and unctuousness are synonyms defined as:

Other synonyms of oiliness include fulsomeness, oleaginousness, smarminess, unction.

oiliness (noun)	unctuousness (noun)
consisting of or covered with oil	smug self-serving earnestness
smug self-serving earnestness