Words that start with 'r' and contain 'fie'

Which word in particular on this page has the largest letter count?
'Radioamplifier'

What is the highest scoring word in Scrabble you can play for ?
One can make 'ramified' scoring 14 points in Scrabble.

What's the maximum number of words one can create from words that start with 'r' and include 'fie'?
From this page of words starting with 'r' that contain 'fie', you have 72 combinations that are available.

Is there an example word from this page of word that starts with 'r' and includes 'fie' that could be considered as unique?
We consider that 'rectifier' to be the most unusual word you can throw together. The dictionary defines it as "1. One who, or that which, rectifies. 2. Specifically: (a) (Naut.) An instrument used for determining and rectifying the variations of the compass on board ship. (B) (Chem.) A rectificator.".

Which word that starts with 'r' and includes 'fie' is the most common word?
We're able to confirm that 'ratified' is the 13837^th most common word.