ordinary bicycle vs bike

ordinary bicycle and bike both are nouns.

Word	Noun	Adjective	Verb	Adverb
ordinary bicycle	Yes	No	No	No
bike	Yes	No	Yes	No

As nouns, bike is a hypernym of ordinary bicycle; that is, bike is a word with a broader meaning than ordinary bicycle:

ordinary bicycle: an early bicycle with a very large front wheel and small back wheel
bike: a wheeled vehicle that has two wheels and is moved by foot pedals

Other hypernyms of ordinary bicycle include bicycle, cycle, wheel.

ordinary bicycle (noun)	bike (noun)
an early bicycle with a very large front wheel and small back wheel	a wheeled vehicle that has two wheels and is moved by foot pedals
	a motor vehicle with two wheels and a strong frame

ordinary bicycle (verb)	bike (verb)
	ride a bicycle