swim vs skinny-dip

swim and skinny-dip both are nouns.

Word	Noun	Adjective	Verb	Adverb
swim	Yes	No	Yes	No
skinny-dip	Yes	No	Yes	No

As nouns, skinny-dip is a hyponym of swim; that is, skinny-dip is a word with a more specific, narrower meaning than swim:

Other hyponyms of swim include bathe, dip, plunge, dive, diving, floating, natation, skin-dive, skin diving.

swim (noun)	skinny-dip (noun)
the act of swimming	a naked swim

swim (verb)	skinny-dip (verb)
travel through water	bathe in the nude
be afloat either on or below a liquid surface and not sink to the bottom
move as if gliding through water
be covered with or submerged in a liquid
be dizzy or giddy