The term 'not quite all' can be broken down into four crossword solutions: SOME (4 letters), MOSTLY (6 letters), MOST (4 letters), and MUCHOF (6 letters). These words all refer to a quantity that is less than the entirety of something. For example, 'SOME' implies a portion of a whole, while 'MOSTLY' implies a majority but not all of something. Similarly, 'MOST' implies a large portion of something, but not all of it, and 'muchof' implies a large amount of something, but not all of it.