9-Letter Words Matching _____DR__

There are 15 9-letter words that match _____DR__. 4 are common words, such as CATHEDRAL and CONUNDRUM. A rarer one is NINHYDRIN. In this set, C is the most frequent open letter (10 words). 0 words contain a doubled letter.

Full list 15

cathedralconundrumeavesdropscoundrelcalendrictrihedraltrihedrontrihydriccathedraecathedrascompadrescylindricholandricmultidrugninhydrin

About this list

Words
15 (4 common words)
Common example
cathedral
Rare example
ninhydrin
Doubled letters
0
Ending in S
2
Most frequent letter
C (10)

Questions

How many 9-letter words matching _____dr__ are there?

15. 4 of them are common words.

What is a common example?

CATHEDRAL is among the common words in this set.