7-Letter Words Matching I_____L

There are 20 7-letter words that match I_____L. 10 are common words, such as ILLEGAL and IMMORAL. A rarer one is ISCHIAL. In this set, N is the most frequent open letter (14 words). 7 words contain a doubled letter.

Full list 20

illegalimmoralimpanelimperilindwellinfidelinitialinkwellinstallinstillicefallimpearlindoxylincisalincivilincudalinthralintimalinvitalischial

About this list

Words
20 (10 common words)
Common example
illegal
Rare example
ischial
Doubled letters
7
Ending in S
0
Most frequent letter
N (14)

Questions

How many 7-letter words matching i_____l are there?

20. 10 of them are common words.

What is a common example?

ILLEGAL is among the common words in this set.