Words that start with 'per' and contain 'i'

What is the most interesting word from this list?
There are a handful of weird words on this page, although our favorite is 'perish'. 'Perish' is defined as "To be destroyed; to pass away; to become nothing; to be lost; to die; hence, to wither; to waste away. I perish with hunger! Luke xv. 17. Grow up and perish, as the summer fly. Milton. The thoughts of a soul that perish in thinking. Locke. To cause perish. [Obs.] Bacon.", according to the dictionary.

How many viable words could one put together using the specified combination?
There are 1,442 entries that address your query.

Which word from this list contains the largest number of letters?
The longest word that's possible to assemble from the combination searched for is 'pericardiomediastinitis', and it is made up of 23 characters.

What is the most popular word that starts with 'per' and includes 'i'?
As far as well-known words go, there's 'period' which is the 926^th most popular word.

What is the highest scoring word in Scrabble available from this list ?
As there are an overwhelming 1,442 entries, you'll want to try 'perijove' which scores 20 points in total.