crosspiece vs spoke

crosspiece and spoke both are nouns.

Word	Noun	Adjective	Verb	Adverb
crosspiece	Yes	No	No	No
spoke	Yes	No	No	No

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

Other hyponyms of crosspiece include crossbar, rundle, rung, round, rung, stave, cross thwart, thwart, transom, traverse.

crosspiece (noun)	spoke (noun)
a transverse brace	support consisting of a radial member of a wheel joining the hub to the rim
a horizontal beam that extends across something	one of the crosspieces that form the steps of a ladder