12-Letter Words Matching D_U_________

There are 19 12-letter words that match D_U_________. 4 are common words, such as DOUBLEHEADER and DOUBLESPEAKS. A rarer one is DRUMBEATINGS. In this set, E is the most frequent open letter (17 words). 5 words contain a doubled letter.

Full list 19

doubleheaderdoublespeaksdoubtfullestdoubtfulnessdeuteranopiadeutschemarkdoublegangerdoublethinksdaughterlessdaunorubicindeuteranopesdeuteranopicdeuterationsdeuterostomediureticallydoublenessesdoughnutlikedouroucoulisdrumbeatings

About this list

Words
19 (4 common words)
Common example
doubleheader
Rare example
drumbeatings
Doubled letters
5
Ending in S
9
Most frequent letter
E (17)

Questions

How many 12-letter words matching d_u_________ are there?

19. 4 of them are common words.

What is a common example?

DOUBLEHEADER is among the common words in this set.