Which word in particular from this list has the highest letter count?The longest word on this list is 'exappendiculate'. It has 15 characters.
What is the most common word that starts with 'exa' and includes 'u'?A popular word for your request is 'exactitude'.
Is there a word from this page which might be considered as unusual?The most unusual word based on expert opinion is 'exauthorize'. The typical definition of 'exauthorize' is as follows: "To deprive of uthority. [Obs.] Selden. To deprive of authority. [Obs.] Selden.". Credit to the Oxford Dictionary.
What is the highest number of points you could get in Scrabble using this list of words starting with 'exa' that contain 'u'?For 17 points, you could use 'exacuate'.
How many acceptable words can you put together from words that start with 'exa' and include 'u'?There are 22 entries which address your query.