11-Letter Words Matching O________I_

There are 19 11-letter words that match O________I_. 4 are common words, such as ORTHODONTIA and ORTHODONTIC. A rarer one is OVEREXPLOIT. In this set, O is the most frequent open letter (16 words). 1 words contain a doubled letter.

Full list 19

orthodontiaorthodonticorthopaedicosteopathicoarsmanshipochlocraticochlophobiaoncogenesisontogeneticorthotropicosteoclasisovovitellinobscuranticontogenesisoptokineticorthoscopicorthostaticoverexplainoverexploit

About this list

Words
19 (4 common words)
Common example
orthodontia
Rare example
overexploit
Doubled letters
1
Ending in S
3
Most frequent letter
O (16)

Questions

How many 11-letter words matching o________i_ are there?

19. 4 of them are common words.

What is a common example?

ORTHODONTIA is among the common words in this set.