6-Letter Words Matching O____N

There are 21 6-letter words that match O____N. 10 are common words, such as OBTAIN and OPTION. A rarer one is OUTSIN. In this set, I is the most frequent open letter (13 words). 2 words contain a doubled letter.

Full list 21

obtainoptionordainoriginorisonorphanoutgunoutranoutrunoxygenoilcanoilmanoilmenolefinoperonoppugnorceinoriganosseinoutmanoutsin

About this list

Words
21 (10 common words)
Common example
obtain
Rare example
outsin
Doubled letters
2
Ending in S
0
Most frequent letter
I (13)

Questions

How many 6-letter words matching o____n are there?

21. 10 of them are common words.

What is a common example?

OBTAIN is among the common words in this set.