15-Letter Words Matching H__________T___

There are 18 15-letter words that match H__________T___. 4 are common words, such as HETEROGENEITIES and HOMOSEXUALITIES. A rarer one is HYPOSTATIZATION. In this set, I is the most frequent open letter (18 words). 1 words contain a doubled letter.

Full list 18

heterogeneitieshomosexualitieshospitalizationhyperactivitieshermaphroditismhierarchizationhorizontalitieshypercorrectionhydroxylapatitehyperinvolutionhypermobilitieshyperparasitismhyperproductionhypersalinitieshypersalivationhypertonicitieshypervelocitieshypostatization

About this list

Words
18 (4 common words)
Common example
heterogeneities
Rare example
hypostatization
Doubled letters
1
Ending in S
8
Most frequent letter
I (18)

Questions

How many 15-letter words matching h__________t___ are there?

18. 4 of them are common words.

What is a common example?

HETEROGENEITIES is among the common words in this set.