Which word in particular from this list consists the highest number of characters?Try 'zairians', which contains 8 characters.
How many possible words can you make using the combination of letters specified?On this page of words starting with 'zai' that contain 'r', you have 4 combinations that are possible altogether.
What is the best score you could get in Scrabble using this list of words that start with 'zai' and include 'r'?4 combinations to choose from, you're only practical word is 'zairians' for a total score of 17 points.