drinking vs swilling

drinking and swilling both are nouns.

Word	Noun	Adjective	Verb	Adverb
drinking	Yes	No	No	No
swilling	Yes	No	No	No

As nouns, swilling is a hyponym of drinking; that is, swilling is a word with a more specific, narrower meaning than drinking:

Other hyponyms of drinking include gulping, guzzling, potation.

drinking (noun)	swilling (noun)
the act of consuming liquids	the drinking of large mouthfuls rapidly
the act of drinking alcoholic beverages to excess