9-Letter Words Matching ____I___H

There are 12 9-letter words that match ____I___H. 5 are common words, such as BILLIONTH and MATRIARCH. A rarer one is ZILLIONTH. 6 words contain a doubled letter.

Full list 12

billionthmatriarchmillionthpatriarchyeshivothcallipashchiliarchkillifishmultipathtallitothvampirishzillionth

About this list

Words
12 (5 common words)
Common example
billionth
Rare example
zillionth
Doubled letters
6
Ending in S
0

Questions

How many 9-letter words matching ____i___h are there?

12. 5 of them are common words.

What is a common example?

BILLIONTH is among the common words in this set.