pedaller vs wheeler

pedaller and wheeler both are nouns.

Word	Noun	Adjective	Verb	Adverb
pedaller	Yes	No	No	No
wheeler	Yes	No	No	No

As nouns, wheeler is a hyponym of pedaller; that is, wheeler is a word with a more specific, narrower meaning than pedaller:

Other hyponyms of pedaller include bicycler, bicyclist, biker, cyclist, unicyclist.

pedaller (noun)	wheeler (noun)
a person who rides a pedal-driven vehicle (as a bicycle)	a draft horse harnessed behind others and nearest the wheels of a vehicle
	someone who makes and repairs wooden wheels
	a person who rides a bicycle
	the man at the outermost end of the rank in wheeling