Words that contain 'a' and end in 'rse'

What is the maximum number of words one can create using words that have 'a' in and end with 'rse'?
From this list of words that have 'a' in and end with 'rse', there are 66 outstanding combinations which are possible in total.

What's the highest scoring word in Scrabble with the above combination ?
For a score of 16 points in Scrabble, it is possible to play 'bawhorse'.

Is there any word on this page that sticks out as the most common?
Our database says the most popular word that have 'a' in and end with 'rse' is 'coarse'.

What's the longest word you can make using words that have 'a' in and end with 'rse'?
The largest word you could derive from this list is 'costotransverse', which has 15 characters.

Is there a word from this page of word that has 'a' in and ends with 'rse' which could be thought of as unique?
An example of an uncommon word from this list goes to 'farse'. The general definition of 'farse' is as follows: "An addition to, or a paraphrase of, some part of the Latin service in the vernacular; -- common in English before the Reformation.".