Words that contain 'if' and end in 'g'

Which word that has 'if' in and ends with 'g' is the most popular word?
We've identified that 'lifting' is the 5816^th most common word.

What is the max number of words one is able to put together from this list?
It's possible to make 392 words from the combination you specified.

What's the longest word you can create using words that have 'if' in and end with 'g'?
'Interdifferentiating'

Is there an example of a word from this page that could be thought of as unique?
Standing as our favorite interesting word on this list is 'whiffing'. The general definition of 'whiffing' is as follows: "1. The act of one who, or that which, whiffs. 2. A mode of fishing with a hand line for pollack, mackerel, and the like.".

What is the highest scoring word in Scrabble you can play for ?
Considering the range of words to pick from, you should select 'quiffing' scoring 24 points.