Words with 'i' as the first letter that end with 'rs'

What is the best score you can get in Scrabble from this list of words beginning with 'i' and ending with 'rs'?
As there are a plethora of words from which to select, you'll want to select 'iodizers' scoring 18 points.

How many letters does the largest word from this page consist of?
The longest word is 15 letters long, which is 'interferometers'.

In total, how many possible words can you make using these particular combinations of letters?
You can pick from 195 entries.

Is there an example word from this page which could be thought of as interesting?
By far the most unusual word from this list is 'indoors'. It means "Within the house; -- usually separated, in doors.".

Which word that starts with 'i' and ends with 'rs' is the most popular word in the dictionary?
There's 'invaders', which is the 15762^nd most common word.