15-Letter Words Matching ______TH_______

There are 28 15-letter words that match ______TH_______. 8 are common words, such as AIRWORTHINESSES and PHILANTHROPISTS. A rarer one is PHILANTHROPOIDS. In this set, I is the most frequent open letter (26 words). 8 words contain a doubled letter.

Full list 28

Common words

airworthinessesphilanthropistsphysiotherapiesphysiotherapistpsychotherapiespsychotherapistseaworthinessesunhealthinessesalgorithmicallyautolithographychlorothiazideslogarithmically
airworthinessesphilanthropistsphysiotherapiesphysiotherapistpsychotherapiespsychotherapistseaworthinessesunhealthinessesalgorithmicallyautolithographychlorothiazideslogarithmicallymetamathematicsphilanthropicalautochthonouslybenzanthracenesbibliotherapieschronotherapiescyanoethylatingcyanoethylationexoerythrocytichelminthologiesheterothallismsimmunotherapiesoverenthusiasmsoverwithholdingphenylthioureasphilanthropoids

About this list

Words
28 (8 common words)
Common example
airworthinesses
Rare example
philanthropoids
Doubled letters
8
Ending in S
17
Most frequent letter
I (26)

Questions

How many 15-letter words matching ______th_______ are there?

28. 8 of them are common words.

What is a common example?

AIRWORTHINESSES is among the common words in this set.