the most selfish one letter word - I. Avoid it
the most satisfying two letter word - We. Use It
the most poisonous three letter word - Ego. Forget It
the most used four letter word - Love. Value It
the most pleasing five letter word - Smile. Keep It
the fastest spreading six letter word - Rumour. Ignore It
the hardest working seven letter word - Success. Achieve It
the most enviable eight letter word - Jealousy. Distance It
the most powerful nine letter word - Knowledge. Acquire It
the most essential ten letter word - Confidence. Trust It
-from ning's blog