buttery vs soapy

buttery is a noun but soapy is not a noun.

Word	Noun	Adjective	Verb	Adverb
buttery	Yes	Yes	No	No
soapy	No	Yes	No	No

As adjectives, buttery and soapy are synonyms defined as:

buttery and soapy: unpleasantly and excessively suave or ingratiating in manner or speech

Other synonyms of buttery include fulsome, oily, oleaginous, smarmy, unctuous.

buttery (noun)	soapy (noun)
a teashop where students in British universities can purchase light meals
a small storeroom for storing foods or wines

buttery (adjective)	soapy (adjective)
resembling or containing or spread with butter	resembling or having the qualities of soap
unpleasantly and excessively suave or ingratiating in manner or speech	unpleasantly and excessively suave or ingratiating in manner or speech