What is the total number of words you could construct using this combination of letters?You'll find 402 words altogether.
What is an interesting word from this list?A good example of a strange word from this list is 'guardhouse'. The typical definition of 'guardhouse' is as follows: "A building which is occupied by the guard, and in which soldiers are confined for misconduct; hence, a lock-up.". Credit to the Oxford Dictionary.
What's the most common word on this page?The most common word for the combination you requested is 'glimpse'.
How many letters are in the longest word on this list?The biggest word one can assemble from this list is 'greaseproofness', which is made up of 15 letters.
What's the highest possible score you can get in Scrabble from this list of words that start with 'g' and include 'se'?Considering the huge variety of words to select from, your best choice is to choose 'geyseric' scoring 14 points.