12-Letter Words Matching __I________R

There are 12 12-letter words that match __I________R. 5 are common words, such as CHIROPRACTOR and HAIRSPLITTER. A rarer one is WEISENHEIMER. In this set, E is the most frequent open letter (10 words). 2 words contain a doubled letter.

Full list 12

chiropractorhairsplitterprimogenitorprizefighterweightlifterklipspringerscintillatortrimolecularchirographerepicuticularstickhandlerweisenheimer

About this list

Words
12 (5 common words)
Common example
chiropractor
Rare example
weisenheimer
Doubled letters
2
Ending in S
0
Most frequent letter
E (10)

Questions

How many 12-letter words matching __i________r are there?

12. 5 of them are common words.

What is a common example?

CHIROPRACTOR is among the common words in this set.