14-Letter Words Matching R_________R___

There are 13 14-letter words that match R_________R___. 3 are common words, such as RADIOTELEGRAPH and RECONNOITERING. A rarer one is RUMORMONGERING. In this set, E is the most frequent open letter (12 words). 4 words contain a doubled letter.

Full list 13

radiotelegraphreconnoiteringreupholsteringrectangularityrectilinearityroentgenogramsroentgenographradioautographreembroideringreencounteringrespirometriesretransferringrumormongering

About this list

Words
13 (3 common words)
Common example
radiotelegraph
Rare example
rumormongering
Doubled letters
4
Ending in S
2
Most frequent letter
E (12)

Questions

How many 14-letter words matching r_________r___ are there?

13. 3 of them are common words.

What is a common example?

RADIOTELEGRAPH is among the common words in this set.