Words that start with 'gru' and contain 'm'

What's the highest scoring word you can play in Scrabble ?
From this particular combination, you could play 'grumphy' scoring 18 points.

How many characters are in the longest word on this page?
The word 'grumbletonian' contains 13 characters.

Is there an example word from this page which might be considered as unusual in any regard?
The most strange word based on expert analysis is 'grumpily'. According to the English dictionary, 'grumpily' means "In a surly manner; sullenly. [Colloq.]".

Which word on this page is the most popular?
As far as well-known words go, there's 'grumbled', which is the 15680^th most common word.

What is the max number of words you are able to make from this combination of letters?
You can pick from 52 words which address your query.