motorbike vs motorcycle

motorbike and motorcycle both are nouns.

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

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

motorbike: small motorcycle with a low frame and small wheels and elevated handlebars
motorcycle: a motor vehicle with two wheels and a strong frame

Other hypernyms of motorbike include bike.

As verbs, motorbike and motorcycle are synonyms defined as:

Other synonyms of motorbike include cycle.

motorbike (noun)	motorcycle (noun)
small motorcycle with a low frame and small wheels and elevated handlebars	a motor vehicle with two wheels and a strong frame

motorbike (verb)	motorcycle (verb)
ride a motorcycle	ride a motorcycle