Wordplay

Wordplay is amazing. Have you ever noticed how there are a lot of words which basically mean the same, yet, when used in place of one another, do not give you the same idea.
Let me cite an example:
When a person loves jazz music, you can call him a "Jazz Aficionado".
At the same time, you cannot call a person who loves metal, a "Metal Aficionado".
Makes him sound like a pussy. Metalhead is a more accurate description.

Many more may spring to your mind. Leave your ideas in the comments.
Peace.