13-Letter Words Matching _________E__R

There are 21 13-letter words that match _________E__R. 1 are common words, such as UNDERACHIEVER and ACCELEROMETER. A rarer one is SUBMILLIMETER. In this set, E is the most frequent open letter (21 words). 9 words contain a doubled letter.

Full list 21

underachieveraccelerometeralcoholometergerrymanderergroundskeeperilluminometerpneumatometerpotentiometerreconnoitererrefractometersaccharometersuperachieverwhithersoeverdemultiplexerelectioneererhemacytometerhemocytometerpyrheliometerreflectometersaccharimetersubmillimeter

About this list

Words
21 (1 common words)
Common example
underachiever
Rare example
submillimeter
Doubled letters
9
Ending in S
0
Most frequent letter
E (21)

Questions

How many 13-letter words matching _________e__r are there?

21. 1 of them are common words.

What is a common example?

UNDERACHIEVER is among the common words in this set.