7-Letter Words Matching ___A__O

There are 21 7-letter words that match ___A__O. 4 are common words, such as BUGABOO and EMBARGO. A rarer one is ZAPATEO. 7 words contain a doubled letter.

Full list 21

bugabooembargoimpastotobaccopalazzoannattocarabaocorantoespartohidalgoretabloarnattobacalaocalandocuracaopicachorubabootamaraounmachozamarrozapateo

About this list

Words
21 (4 common words)
Common example
bugaboo
Rare example
zapateo
Doubled letters
7
Ending in S
0

Questions

How many 7-letter words matching ___a__o are there?

21. 4 of them are common words.

What is a common example?

BUGABOO is among the common words in this set.