13-Letter Words Matching _I________H__

There are 12 13-letter words that match _I________H__. 5 are common words, such as BIBLIOGRAPHER and BIBLIOGRAPHIC. A rarer one is NIGHTMARISHLY. In this set, I is the most frequent open letter (10 words). 3 words contain a doubled letter.

Full list 12

bibliographerbibliographicdistinguisheddistinguishesmiddleweightsbiogeographerlibrarianshipbiogeographicbitterbrushesdieffenbachiamicroswitchesnightmarishly

About this list

Words
12 (5 common words)
Common example
bibliographer
Rare example
nightmarishly
Doubled letters
3
Ending in S
4
Most frequent letter
I (10)

Questions

How many 13-letter words matching _i________h__ are there?

12. 5 of them are common words.

What is a common example?

BIBLIOGRAPHER is among the common words in this set.