ladder vs rung

ladder and rung both are nouns.

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

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

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