Is there any kind of pun/similarity in Hebrew between "Cursed is Haman" and "Blessed is Mordechai"?

I vaguely remember reading once that there is some similarity in Hebrew between “Cursed is Haman” and “Blessed is Mordechai” – The idea being that one wouldn’t need to be all that drunk in order to be unable to tell the phrases apart.

I’ve tried asking a couple of rabbis at various points and they didn’t know what I was referring to. And with my limited knowledge of Hebrew, I wouldn’t think the two phrases would sound similar at all.

Is there anything to this? Is it perhaps something Gematria related?