In reply to:

Dear tsuwn[sic], I love it when you say, "...yet another enantiodromic word !" But sometimes tsuwn, you frighten me. Does every word have it's own word to describe it?

I wish! enantiodromic came to pass because so many folks asked "is there a word to describe words which have two diametrically opposed meanings?" so we "transferred" enantiodromic. (enantiodromia - the process by which something becomes its opposite, and the subsequent interaction of the two: applied esp. to the adoption by an individual or by a community, etc., of a set of beliefs, etc., opposite to those held at an earlier stage.

[this is the usual process by which this happens. the other way is, well, coincidence; as when two words develop independently, such as with cleave (and cleave).]