6-Letter Words Matching I___O_

There are 13 6-letter words that match I___O_. 5 are common words, such as ICEBOX and IGLOOS. A rarer one is ISOLOG. In this set, S is the most frequent open letter (7 words). 2 words contain a doubled letter.

Full list 13

iceboxigloosindoorinflowintrosisogonisopodimagosimprovinkpotintronirokosisolog

About this list

Words
13 (5 common words)
Common example
icebox
Rare example
isolog
Doubled letters
2
Ending in S
4
Most frequent letter
S (7)

Questions

How many 6-letter words matching i___o_ are there?

13. 5 of them are common words.

What is a common example?

ICEBOX is among the common words in this set.