12-Letter Words Matching H_____T_____

There are 24 12-letter words that match H_____T_____. 5 are common words, such as HEARTSTRINGS and HEMSTITCHING. A rarer one is HYPERSTHENIC. In this set, I is the most frequent open letter (20 words). 2 words contain a doubled letter.

Full list 24

heartstringshemstitchinghesitatinglyhopscotchinghumanitarianhabilitatinghabilitationhelianthuseshereditamenthereditarilyheterotrophyhexametricalhydrastininehydrostaticshaircuttingsharvesttimesheldentenorshemerythrinshemstitchershereditarianheterotrophshomoiothermshyperstheneshypersthenic

About this list

Words
24 (5 common words)
Common example
heartstrings
Rare example
hypersthenic
Doubled letters
2
Ending in S
11
Most frequent letter
I (20)

Questions

How many 12-letter words matching h_____t_____ are there?

24. 5 of them are common words.

What is a common example?

HEARTSTRINGS is among the common words in this set.