13-Letter Words Matching I______O_____

There are 24 13-letter words that match I______O_____. 6 are common words, such as IMMUNOLOGICAL and IMMUNOLOGISTS. A rarer one is ISOCARBOXAZID. In this set, N is the most frequent open letter (23 words). 9 words contain a doubled letter.

Full list 24

immunologicalimmunologistsinspectoratesintentionallyisolationismsisolationistsilluminometerintensionallyintuitionallyintuitionismsimmunosorbentinflationismsinflationistsinspectorshipintercroppingintercrossinginterproximalintertropicalintrathoracicintuitionistsiontophoresesiontophoresisiontophoreticisocarboxazid

About this list

Words
24 (6 common words)
Common example
immunological
Rare example
isocarboxazid
Doubled letters
9
Ending in S
10
Most frequent letter
N (23)

Questions

How many 13-letter words matching i______o_____ are there?

24. 6 of them are common words.

What is a common example?

IMMUNOLOGICAL is among the common words in this set.