10-Letter Words Containing HTH

There are 16 10-letter words that contain HTH. 6 are common words, such as DIPHTHERIA and DIPHTHONGS. A rarer one is PHTHISICAL. In this set, I is the most frequent open letter (13 words). 1 words contain a doubled letter.

Full list 16

diphtheriadiphthongsknighthoodlighthousenighthawksophthalmicapophthegmautochthondiphthericichthyosisknightheadophthalmiatriphthongnaphthenesnaphthenicphthisical

About this list

Words
16 (6 common words)
Common example
diphtheria
Rare example
phthisical
Doubled letters
1
Ending in S
4
Most frequent letter
I (13)

Questions

How many 10-letter words containing hth are there?

16. 6 of them are common words.

What is a common example?

DIPHTHERIA is among the common words in this set.