unicycle vs bike

unicycle and bike both are nouns.

Word	Noun	Adjective	Verb	Adverb
unicycle	Yes	No	Yes	No
bike	Yes	No	Yes	No

As verbs, bike is a hypernym of unicycle; that is, bike is a word with a broader meaning than unicycle:

Other hypernyms of unicycle include bicycle, cycle, pedal, wheel.

unicycle (noun)	bike (noun)
a vehicle with a single wheel that is driven by pedals	a wheeled vehicle that has two wheels and is moved by foot pedals
	a motor vehicle with two wheels and a strong frame

unicycle (verb)	bike (verb)
ride a unicycle	ride a bicycle