12-Letter Words Matching O_I_________

There are 19 12-letter words that match O_I_________. 5 are common words, such as ODIOUSNESSES and OLIGARCHICAL. A rarer one is OVIPOSITIONS. In this set, I is the most frequent open letter (15 words). 3 words contain a doubled letter.

Full list 19

odiousnessesoligarchicalorientationsoriginationsoxidizationsoligochaetesopinionativeorientalistsorientalizedorientalizesorienteeringoligophagiesoligophagousoligopsoniesoligotrophicorientalismsorismologiesotiosenessesovipositions

About this list

Words
19 (5 common words)
Common example
odiousnesses
Rare example
ovipositions
Doubled letters
3
Ending in S
14
Most frequent letter
I (15)

Questions

How many 12-letter words matching o_i_________ are there?

19. 5 of them are common words.

What is a common example?

ODIOUSNESSES is among the common words in this set.