15-Letter Words Matching R________O_____

There are 13 15-letter words that match R________O_____. 1 are common words, such as REAPPORTIONMENT and RADIOMICROMETER. A rarer one is RIBONUCLEOTIDES. In this set, I is the most frequent open letter (12 words). 1 words contain a doubled letter.

Full list 13

reapportionmentradiomicrometerradiophotographradiobiologicalradiobiologistsrechromatographrepudiationistsreservationistsrestrictionismsrestrictionistsrheumatologistsribonucleosidesribonucleotides

About this list

Words
13 (1 common words)
Common example
reapportionment
Rare example
ribonucleotides
Doubled letters
1
Ending in S
8
Most frequent letter
I (12)

Questions

How many 15-letter words matching r________o_____ are there?

13. 1 of them are common words.

What is a common example?

REAPPORTIONMENT is among the common words in this set.