moped vs motorbike

moped and motorbike both are nouns.

Word	Noun	Adjective	Verb	Adverb
moped	Yes	No	No	No
motorbike	Yes	No	Yes	No

As nouns, motorbike is a hypernym of moped; that is, motorbike is a word with a broader meaning than moped:

moped: a motorbike that can be pedaled or driven by a low-powered gasoline engine
motorbike: small motorcycle with a low frame and small wheels and elevated handlebars

Other hypernyms of moped include minibike.

moped (noun)	motorbike (noun)
a motorbike that can be pedaled or driven by a low-powered gasoline engine	small motorcycle with a low frame and small wheels and elevated handlebars

moped (verb)	motorbike (verb)
	ride a motorcycle