rung vs spoke

rung and spoke both are nouns.

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

As nouns, rung and spoke are synonyms defined as:

Other synonyms of rung include rundle.

rung (noun)	spoke (noun)
one of the crosspieces that form the steps of a ladder	support consisting of a radial member of a wheel joining the hub to the rim
a crosspiece between the legs of a chair	one of the crosspieces that form the steps of a ladder