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bicycle vs mountain bike mountain bike vs bicycle

bicycle and mountain bike both are nouns.

bicycle is a verb but mountain bike is not a verb.

As nouns, mountain bike is a hyponym of bicycle; that is, mountain bike is a word with a more specific, narrower meaning than bicycle and mountain bike is a type of bicycle with the definitions:
  • a wheeled vehicle that has two wheels and is moved by foot pedals
bicycle (noun) mountain bike (noun)
a wheeled vehicle that has two wheels and is moved by foot pedals a bicycle with a sturdy frame and fat tires; originally designed for riding in mountainous country
bicycle (verb) mountain bike (verb)
ride a bicycle