13-Letter Words Matching ______H_M____

There are 17 13-letter words that match ______H_M____. 2 are common words, such as PETROCHEMICAL and SLEDGEHAMMERS. A rarer one is RADIOCHEMISTS. In this set, E is the most frequent open letter (16 words). 4 words contain a doubled letter.

Full list 17

petrochemicalsledgehammersaccouchementscosmochemicalphotochemicalphytochemicalradiochemicalyellowhammerscallithumpiancosmochemistsglutethimideshistochemicalneurochemicalneurochemistsphotochemistsphytochemistsradiochemists

About this list

Words
17 (2 common words)
Common example
petrochemical
Rare example
radiochemists
Doubled letters
4
Ending in S
9
Most frequent letter
E (16)

Questions

How many 13-letter words matching ______h_m____ are there?

17. 2 of them are common words.

What is a common example?

PETROCHEMICAL is among the common words in this set.