race vs speed skate

race and speed skate both are nouns.

Word	Noun	Adjective	Verb	Adverb
race	Yes	No	Yes	No
speed skate	Yes	No	Yes	No

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

Other hyponyms of race include show, place, boat-race, horse-race, campaign, run.

race (noun)	speed skate (noun)
a canal for a current of water	an ice skate with a long blade; worn for racing
a contest of speed
any competition
people who are believed to belong to the same genetic stock
(biology) a taxonomic group that is a division of a species; usually arises as a consequence of geographical isolation within a species
the flow of air that is driven backwards by an aircraft propeller

race (verb)	speed skate (verb)
compete in a race	race on skates
move hurridly
cause to move fast or to rush or race
to work as fast as possible towards a goal, sometimes in competition with others