Stretched, Strengths - longest one-syllable words?

​

Aa - shortest two-syllable word  (It's a kind of lava.)

​

Rotor - a palindrome you can spin!

​

Chai tea - thai chi  A spoonerism that makes sense both ways.  from Viveca Gardiner

​

The word "standard" is the letters from 1st, 2nd, 3rd with "a"s slipped in.  from Roderick Kimball

​

Sine is a word we abbreviate by removing one letter.  (sin --- trigonometric function)  Are there others?

​

Words used only when accompanied by certain other words.  So far, I've thought of "vim" and "thither".

​

"Bookkeeper" has three sets of double letters in a row.  Are there any other words like this?

​