13-Letter Words Matching ____I_____A__

There are 14 13-letter words that match ____I_____A__. 6 are common words, such as COMMISSARIATS and PARLIAMENTARY. A rarer one is SUBLIBRARIANS. In this set, T is the most frequent open letter (11 words). 2 words contain a doubled letter.

Full list 14

commissariatsparliamentaryparticleboardphysiotherapystatisticiansstraightawaysbibliotherapyprehistorianssublieutenantbibliomaniacsmultimegawattmultinucleatenonlibrarianssublibrarians

About this list

Words
14 (6 common words)
Common example
commissariats
Rare example
sublibrarians
Doubled letters
2
Ending in S
7
Most frequent letter
T (11)

Questions

How many 13-letter words matching ____i_____a__ are there?

14. 6 of them are common words.

What is a common example?

COMMISSARIATS is among the common words in this set.