6-Letter Words Matching R____A

There are 18 6-letter words that match R____A. 3 are common words, such as RAFFIA and RETINA. A rarer one is RUGOSA. In this set, I is the most frequent open letter (8 words). 2 words contain a doubled letter.

Full list 18

raffiaretinarostrarazziaremoraresedaristraruminaradularanularaphiarealiaredowareginaremudarhumbarugolarugosa

About this list

Words
18 (3 common words)
Common example
raffia
Rare example
rugosa
Doubled letters
2
Ending in S
0
Most frequent letter
I (8)

Questions

How many 6-letter words matching r____a are there?

18. 3 of them are common words.

What is a common example?

RAFFIA is among the common words in this set.