15-Letter Words Matching _________R_H___

There are 12 15-letter words that match _________R_H___. 3 are common words, such as AMBASSADORSHIPS and CHANCELLORSHIPS. A rarer one is POSTMASTERSHIPS. In this set, I is the most frequent open letter (12 words). 4 words contain a doubled letter.

Full list 12

ambassadorshipschancellorshipsproprietorshipscontrollershipscountermarchinginstructorshipscouncillorshipsenantiomorphismenantiomorphousheadmastershipslegislatorshipspostmasterships

About this list

Words
12 (3 common words)
Common example
ambassadorships
Rare example
postmasterships
Doubled letters
4
Ending in S
10
Most frequent letter
I (12)

Questions

How many 15-letter words matching _________r_h___ are there?

12. 3 of them are common words.

What is a common example?

AMBASSADORSHIPS is among the common words in this set.