15-Letter Words Matching O_____________Y

There are 12 15-letter words that match O_____________Y. 0 are common words, such as OBSERVATIONALLY and ONTOGENETICALLY. A rarer one is OVOVIVIPAROUSLY. In this set, I is the most frequent open letter (11 words). 5 words contain a doubled letter.

Full list 12

observationallyontogeneticallyorthodonticallyorthopsychiatryosteopathicallyoverambitiouslyovercomplacencyoverfamiliarityoversensitivityorientationallyoverconfidentlyovoviviparously

About this list

Words
12 (0 common words)
Common example
observationally
Rare example
ovoviviparously
Doubled letters
5
Ending in S
0
Most frequent letter
I (11)

Questions

How many 15-letter words matching o_____________y are there?

12. 0 of them are common words.

What is a common example?

OBSERVATIONALLY is among the common words in this set.