6-Letter Words Matching R____O

There are 13 6-letter words that match R____O. 3 are common words, such as REECHO and ROCOCO. A rarer one is RUBIGO. In this set, A is the most frequent open letter (8 words). 1 words contain a doubled letter.

Full list 13

reechorococorubatorabatoranchorebatorebozorialtorightorobaloroadeoromanorubigo

About this list

Words
13 (3 common words)
Common example
reecho
Rare example
rubigo
Doubled letters
1
Ending in S
0
Most frequent letter
A (8)

Questions

How many 6-letter words matching r____o are there?

13. 3 of them are common words.

What is a common example?

REECHO is among the common words in this set.