12-Letter Words Matching _____O_N____

There are 22 12-letter words that match _____O_N____. 8 are common words, such as CALIFORNIUMS and DUMBFOUNDING. A rarer one is TYPEFOUNDING. In this set, E is the most frequent open letter (17 words). 10 words contain a doubled letter.

Full list 22

californiumsdumbfoundingmillionnairereappointingstubbornnessteaspoonfulsteaspoonsfulunrecognizedchaetognathsgastrocnemiiphysiognomicplectognathspsychognosischansonniersdumbfounderslovelornnessmegatonnagesovercountingreencountersrockhoundingtypefounderstypefounding

About this list

Words
22 (8 common words)
Common example
californiums
Rare example
typefounding
Doubled letters
10
Ending in S
12
Most frequent letter
E (17)

Questions

How many 12-letter words matching _____o_n____ are there?

22. 8 of them are common words.

What is a common example?

CALIFORNIUMS is among the common words in this set.