6-Letter Words Matching ___R_O

There are 12 6-letter words that match ___R_O. 7 are common words, such as BARRIO and EMBRYO. A rarer one is KARROO. In this set, A is the most frequent open letter (6 words). 3 words contain a doubled letter.

Full list 12

barrioembryohairdooverdoquartostereoweirdojournovibriocharrogheraokarroo

About this list

Words
12 (7 common words)
Common example
barrio
Rare example
karroo
Doubled letters
3
Ending in S
0
Most frequent letter
A (6)

Questions

How many 6-letter words matching ___r_o are there?

12. 7 of them are common words.

What is a common example?

BARRIO is among the common words in this set.