12-Letter Words Matching __I________L

There are 14 12-letter words that match __I________L. 5 are common words, such as ARITHMETICAL and COINCIDENTAL. A rarer one is URINOGENITAL. In this set, A is the most frequent open letter (13 words). 2 words contain a doubled letter.

Full list 14

arithmeticalcoincidentaloligarchicalphilologicalwhippoorwillepigraphicalprimogenitalquinquennialstigmasterolepicycloidaltribologicaltriglyphicaltriphthongalurinogenital

About this list

Words
14 (5 common words)
Common example
arithmetical
Rare example
urinogenital
Doubled letters
2
Ending in S
0
Most frequent letter
A (13)

Questions

How many 12-letter words matching __i________l are there?

14. 5 of them are common words.

What is a common example?

ARITHMETICAL is among the common words in this set.