hunch

a euphmism is a word that is used as a replacement in order to soften or obscure the meaning of an ugly or unpleasant word.

A double entendre is a word that is used to transmit a veiled message. (though obvious enough to be understood)

In a way the are opposites. (I think)
One to obscure against one to reveal.

(A double entendre can go for sexual insinuations, irony, insults and maybe much more)