What's the most common word for this page?The most popular word for the combination you requested is 'vapor'.
Which word that starts with 'vap' is the most unusual?Dictionarypedia feels 'vaporer' to be the most peculiar word. 'Vaporer''s definition is "One who vapors; a braggart. Vaporer moth. (Zoöl.) See Orgyia.", according to the dictionary.
What's the highest scoring word you can play in Scrabble ?For 22 points in Scrabble, you could play 'vaporize'.
What's the longest word you can create with this list?'Vapocauterization' is the longest word that our database could find. It consists of 17 characters.
How many acceptable words are possible to make using the specified combination?From this page of words that start with 'vap', you have 96 entries which are available altogether.