clutch pedal vs treadle

clutch pedal and treadle both are nouns.

Word	Noun	Adjective	Verb	Adverb
clutch pedal	Yes	No	No	No
treadle	Yes	No	Yes	No

As nouns, treadle is a hypernym of clutch pedal; that is, treadle is a word with a broader meaning than clutch pedal:

clutch pedal: a pedal or lever that engages or disengages a rotating shaft and a driving mechanism
treadle: a lever that is operated with the foot

Other hypernyms of clutch pedal include foot lever, foot pedal, pedal.

clutch pedal (noun)	treadle (noun)
a pedal or lever that engages or disengages a rotating shaft and a driving mechanism	a lever that is operated with the foot

clutch pedal (verb)	treadle (verb)
	operate (machinery) by a treadle
	tread over