tricycle vs velocipede

tricycle and velocipede both are nouns.

Word	Noun	Adjective	Verb	Adverb
tricycle	Yes	No	No	No
velocipede	Yes	No	No	No

As nouns, tricycle and velocipede are synonyms defined as:

tricycle and velocipede: a vehicle with three wheels that is moved by foot pedals

Other synonyms of tricycle include trike.

tricycle (noun)	velocipede (noun)
a vehicle with three wheels that is moved by foot pedals	a vehicle with three wheels that is moved by foot pedals
	any of several early bicycles with pedals on the front wheel