Words that contain 'er' and end in 'r'

What is the most common word that has 'er' in and ends with 'r' in the dictionary?
A common word for your request is 'superior'.

How many letters does the largest word from this page contain?
'Electrotelethermometer' is the longest word that we could assemble, containing 22 characters

Which word that has 'er' in and ends with 'r' is the most unusual?
Our favorite unusual word from this list goes to 'underactor'. The definition of 'underactor' is as follows: "A subordinate actor.".

What is the max number of words you can create from words that have 'er' in and end with 'r'?
In total, there are 1,856 words.

What's the highest scoring word in Scrabble available from this list ?
With the volume of words to choose from, your best bet is to go for 'jerquer' which scores 23 points.