13-Letter Words Matching ________O_R__

There are 16 13-letter words that match ________O_R__. 5 are common words, such as ARCHBISHOPRIC and CHECKERBOARDS. A rarer one is SCRATCHBOARDS. In this set, A is the most frequent open letter (16 words). 4 words contain a doubled letter.

Full list 16

archbishopriccheckerboardsparallelogramplasterboardsshuffleboardsclapperboardsdraughtboardsencephalogramroentgenogramweatherboardsautoradiogramcholangiogramflutterboardsinterferogramplethysmogramscratchboards

About this list

Words
16 (5 common words)
Common example
archbishopric
Rare example
scratchboards
Doubled letters
4
Ending in S
8
Most frequent letter
A (16)

Questions

How many 13-letter words matching ________o_r__ are there?

16. 5 of them are common words.

What is a common example?

ARCHBISHOPRIC is among the common words in this set.