coast vs snowboarding

coast and snowboarding both are nouns.

Word	Noun	Adjective	Verb	Adverb
coast	Yes	No	Yes	No
snowboarding	Yes	No	No	No

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

coast: the act of moving smoothly along a surface while remaining in contact with it
snowboarding: the act of sliding down a snow-covered slope while standing on a snowboard

Other hyponyms of coast include sideslip, skid, slip.

coast (noun)	snowboarding (noun)
the act of moving smoothly along a surface while remaining in contact with it	the act of sliding down a snow-covered slope while standing on a snowboard
the area within view
the shore of a sea or ocean
a slope down which sleds may coast

coast (verb)	snowboarding (verb)
move effortlessly; by force of gravity