Word books traditionally focus on unusual and quirky items. They tend to ignore the words that provide the skeleton of the language, without which it would fall apart, such as 'and' and 'what,' or words that provide structure to our conversation, such as 'hello.
David CrystalLanguage changes and moves in a different direction evolving all the time. Where a lot of people see deterioration, I see expressive development
David CrystalLanguage itself changes slowly but the internet has speeded up the process of those changes so you notice them more quickly.
David Crystal