8-Letter Words Matching ____I__O

There are 13 8-letter words that match ____I__O. 2 are common words, such as FLAMINGO and MACHISMO. A rarer one is TORNILLO. 5 words contain a doubled letter.

Full list 13

flamingomachismocaudillocontinuograciosohereintoocotillopresidiograziosoleggieromillimhopachinkotornillo

About this list

Words
13 (2 common words)
Common example
flamingo
Rare example
tornillo
Doubled letters
5
Ending in S
0

Questions

How many 8-letter words matching ____i__o are there?

13. 2 of them are common words.

What is a common example?

FLAMINGO is among the common words in this set.