15-Letter Words Matching __________I_A__

There are 12 15-letter words that match __________I_A__. 2 are common words, such as NONDISCIPLINARY and PHARMACEUTICALS. A rarer one is UNEXTRAORDINARY. In this set, E is the most frequent open letter (11 words). 3 words contain a doubled letter.

Full list 12

nondisciplinarypharmaceuticalsantepenultimatecounterclaimantcounterirritanttransilluminatealuminosilicatebiogeochemicalsmethylphenidateovercommunicatepsychochemicalsunextraordinary

About this list

Words
12 (2 common words)
Common example
nondisciplinary
Rare example
unextraordinary
Doubled letters
3
Ending in S
3
Most frequent letter
E (11)

Questions

How many 15-letter words matching __________i_a__ are there?

12. 2 of them are common words.

What is a common example?

NONDISCIPLINARY is among the common words in this set.