15-Letter Words Matching ___I__T________

There are 21 15-letter words that match ___I__T________. 4 are common words, such as INFINITESIMALLY and SPRIGHTLINESSES. A rarer one is SEMIRETIREMENTS. In this set, N is the most frequent open letter (20 words). 8 words contain a doubled letter.

Full list 21

infinitesimallysprightlinessesunrighteousnessunsightlinessesantinationalistexhibitionisticperipateticallyantimaterialismantimaterialistantimetabolitesantirationalismantirationalistantirationalitybenightednessesdelightednessesderivatizationsfutilitarianismillimitablenessnoninstrumentalradiostrontiumssemiretirements

About this list

Words
21 (4 common words)
Common example
infinitesimally
Rare example
semiretirements
Doubled letters
8
Ending in S
10
Most frequent letter
N (20)

Questions

How many 15-letter words matching ___i__t________ are there?

21. 4 of them are common words.

What is a common example?

INFINITESIMALLY is among the common words in this set.