12-Letter Words Matching _____I_____R

There are 12 12-letter words that match _____I_____R. 5 are common words, such as CONQUISTADOR and DEHUMIDIFIER. A rarer one is SEMIDIAMETER. In this set, T is the most frequent open letter (10 words). 1 words contain a doubled letter.

Full list 12

conquistadordehumidifierexperimenterpractitionersemicircularexhibitionerscintillatorthereinafterequilibratorfractionatormaterializersemidiameter

About this list

Words
12 (5 common words)
Common example
conquistador
Rare example
semidiameter
Doubled letters
1
Ending in S
0
Most frequent letter
T (10)

Questions

How many 12-letter words matching _____i_____r are there?

12. 5 of them are common words.

What is a common example?

CONQUISTADOR is among the common words in this set.