13-Letter Words Matching O_S__________

There are 16 13-letter words that match O_S__________. 9 are common words, such as OBSCURANTISMS and OBSCURANTISTS. A rarer one is OBSTINATENESS. In this set, B is the most frequent open letter (14 words). 6 words contain a doubled letter.

Full list 16

obscurantismsobscurantistsobservationalobservatoriesobsessivenessobsolescencesobstetriciansobstructivelyossificationsobscurenessesobservabilityobsessionallyobsolescentlyoystercatcherobstetricallyobstinateness

About this list

Words
16 (9 common words)
Common example
obscurantisms
Rare example
obstinateness
Doubled letters
6
Ending in S
9
Most frequent letter
B (14)

Questions

How many 13-letter words matching o_s__________ are there?

16. 9 of them are common words.

What is a common example?

OBSCURANTISMS is among the common words in this set.