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

In Scrabble, what's the highest number of points you can get from words that start with 'rai' and include 'r'?
For 13 points in Scrabble, one could use 'raiiform'.

Which word on this page is the most common?
The most common word is 'railroad', which in fact is the 4560^th most popular word in this list.

Which word from this list is the most unique?
The most strange word in this list is 'railroading'. The dictionary defines it as "The construction of a railroad; the business of managing or operating a railroad. [Colloq. U. S.]".

Which word from this list consists the largest number of characters?
The longest word is 12 letters long, which is 'railroadiana'.

In total, how many words could you make using these specific combinations of letters?
It's possible to derive 43 words from the combination of words that start with 'rai' and include 'r'.