13-Letter Words Containing TOI

There are 12 13-letter words that contain TOI. 1 are common words, such as TORTOISESHELL and CONSERVATOIRE. A rarer one is PHOTOIONIZING. In this set, E is the most frequent open letter (10 words). 3 words contain a doubled letter.

Full list 12

tortoiseshellconservatoireghettoizationmastoidectomymastoiditidesstoichiometryanaphylactoidautoinfectionfianchettoinghypoeutectoidmastoiditisesphotoionizing

About this list

Words
12 (1 common words)
Common example
tortoiseshell
Rare example
photoionizing
Doubled letters
3
Ending in S
2
Most frequent letter
E (10)

Questions

How many 13-letter words containing toi are there?

12. 1 of them are common words.

What is a common example?

TORTOISESHELL is among the common words in this set.