skate vs skateboard

skate and skateboard both are nouns.

Word	Noun	Adjective	Verb	Adverb
skate	Yes	No	Yes	No
skateboard	Yes	No	Yes	No

As verbs, skateboard is a hyponym of skate; that is, skateboard is a word with a more specific, narrower meaning than skate:

Other hyponyms of skate include ice skate, figure skate, roller skate, Rollerblade.

skate (noun)	skateboard (noun)
large edible rays having a long snout and thick tail with pectoral fins continuous with the head; swim by undulating the edges of the pectoral fins	a board with wheels that is ridden in a standing or crouching position and propelled by foot
sports equipment that is worn on the feet to enable the wearer to glide along and to be propelled by the alternate actions of the legs

skate (verb)	skateboard (verb)
move along on skates	ride on a flat board with rollers attached to the bottom