15-Letter Words Matching H_____E________

There are 21 15-letter words that match H_____E________. 5 are common words, such as HEARTLESSNESSES and HUMORLESSNESSES. A rarer one is HYSTERECTOMIZED. In this set, R is the most frequent open letter (20 words). 8 words contain a doubled letter.

Full list 21

heartlessnesseshumorlessnesseshydrocephaluseshyperventilatedhyperventilatesheliocentricityhermeneuticallyhexylresorcinolhydrometallurgyheliometricallyhouselessnesseshydromechanicalhyperaesthesiashypermetabolismhyperreactivityhyperresponsivehypersecretionshypersensitizedhypersensitizeshypervelocitieshysterectomized

About this list

Words
21 (5 common words)
Common example
heartlessnesses
Rare example
hysterectomized
Doubled letters
8
Ending in S
9
Most frequent letter
R (20)

Questions

How many 15-letter words matching h_____e________ are there?

21. 5 of them are common words.

What is a common example?

HEARTLESSNESSES is among the common words in this set.