Words that rhyme with douane

What do these rhymes mean?

barn

an outlying farm building for storing grain or animal feed and housing farm animals (physics) a unit of nuclear cross

darn

something of little value; "his promise is not worth a damn"; "not worth one red cent

guan

any of several large turkey-like game birds of the family Cracidae; native to jungles of tropical America

non

negation of a word or group of words; "he does not speak French"; "she is not going"; "they are not friends

on

with a forward motion; "we drove along admiring the view"; "the horse trotted along at a steady pace