13-Letter Words Matching ____R___D____

There are 14 13-letter words that match ____R___D____. 3 are common words, such as UNDERGRADUATE and UNDERHANDEDLY. A rarer one is SUPERHARDENED. 2 words contain a doubled letter.

Full list 14

undergraduateunderhandedlyunderstudyingchlorohydrinsclearheadedlyhyperproducerinterepidemicintermeddlersintermeddlinginterpandemicinterstadialsmonorchidismssuperconductssuperhardened

About this list

Words
14 (3 common words)
Common example
undergraduate
Rare example
superhardened
Doubled letters
2
Ending in S
5

Questions

How many 13-letter words matching ____r___d____ are there?

14. 3 of them are common words.

What is a common example?

UNDERGRADUATE is among the common words in this set.