13-Letter Words Matching _________I__R

There are 15 13-letter words that match _________I__R. 4 are common words, such as COUNTERFEITER and PHILOSOPHIZER. A rarer one is PROPAGANDIZER. In this set, E is the most frequent open letter (14 words). 4 words contain a doubled letter.

Full list 15

counterfeiterphilosophizerpredeterminertranquillizerattitudinizercharacterizercircumscriberdemineralizereditorializersupercollidervasoinhibitorbraillewritercountersnipernoncompetitorpropagandizer

About this list

Words
15 (4 common words)
Common example
counterfeiter
Rare example
propagandizer
Doubled letters
4
Ending in S
0
Most frequent letter
E (14)

Questions

How many 13-letter words matching _________i__r are there?

15. 4 of them are common words.

What is a common example?

COUNTERFEITER is among the common words in this set.