9-Letter Words Matching H_______M

There are 23 9-letter words that match H_______M. 6 are common words, such as HAILSTORM and HARMONIUM. A rarer one is HYDRONIUM. In this set, I is the most frequent open letter (18 words). 3 words contain a doubled letter.

Full list 23

hailstormharmoniumhectogramhistogramhybridismhypnotismheartwormherbalismherbariumheteronymhierogramhippiedomhirsutismhospitiumhouseroomhylozoismhyperformhermetismhermitismheroinismhispanismhoodooismhydronium

About this list

Words
23 (6 common words)
Common example
hailstorm
Rare example
hydronium
Doubled letters
3
Ending in S
0
Most frequent letter
I (18)

Questions

How many 9-letter words matching h_______m are there?

23. 6 of them are common words.

What is a common example?

HAILSTORM is among the common words in this set.