Words that contain 'p' and end in 'yer'

How many letters are in the largest word on this list?
The largest word is 13 characters, which is 'counterplayer'.

Is there any word on this page that stands out as the most common?
Rating as the 2308^th most popular word, you'll want to ensure you've got 'prayer' in your repertoire.

Is there a word from this page of word that has 'p' in and ends with 'yer' that could be considered as unique?
An example of an unusual word from this list goes to 'employer'. The definition of 'employer' is as follows: "One who employs another; as, an employer of workmen.". Credit goes to Oxford Dictionary.

How many words are possible to put together using the specified combination?
You can choose from up to 35 words.

What's the highest number of points you can get in Scrabble using this list of words that have 'p' in and end with 'yer'?
For 20 points, you could use 'taxpayer'.