I quite agree with these ideas!!!
The most selfish 1 letter word - I- Avoid It
The most satisfying 2 letter word - We - Use It
The most poisonous 3 letter word - Ego - Kill It
The most used 4 letter word - Love - Value It
The most pleasing 5 letter word - Smile - Keep It
The fastest spreading 6 letter word - Rumour - Ignore It
The hardest working 7 letter word - Success - Achieve It
The most enviable 8 letter word - Jealousy - Distance It
The most powerful 9 letter word - Knowledge - Acquire It
The most essential 10 letter word - Confidence - Trust It