Interesting Words - Scrabble

Once a word gets into the Scrabble Dictionary, it never drops out.
Source - Wikipedia  

(The only exception is for words mistakenly included.

For example "pH", which in the 1990s was taken out when someone realised it was an abbreviation.

According to the publisher, Collins "Scrabble players don't like to unlearn words."   I'm not sure if you can "unlearn" something.

BTW - I'm sure one of the words in this picture should be "bitten".)