What's the highest scoring Scrabble word possible to make?
From this combination, the best word you ought to play is scoring points.
What's the maximum no. of words one can construct from this list?
From this page of beginning with 'imm' and ending with 'm', you have 7 combinations which are possible.
Using that start with 'imm' and end with 'm', what is the biggest word possible to create?
The longest word is 13 letters long, which is immaterialism.
Is there an example word from this page which could be deemed as unusual?
The most unusual word from this list is certainly immediatism. The definition of immediatism is as follows: "Immediateness."