rung vs ladder

rung and ladder both are nouns.

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

rung (noun)	ladder (noun)
one of the crosspieces that form the steps of a ladder	steps consisting of two parallel members connected by rungs; for climbing up or down
a crosspiece between the legs of a chair	a row of unravelled stitches
	ascending stages by which somebody or something can progress

rung (verb)	ladder (verb)
	come unraveled or undone as if by snagging