11-Letter Words Matching E________U_

There are 13 11-letter words that match E________U_. 4 are common words, such as EFFICACIOUS and EINSTEINIUM. A rarer one is EPIGASTRIUM. In this set, I is the most frequent open letter (11 words). 2 words contain a doubled letter.

Full list 13

efficaciouseinsteiniumequilibriumexpeditiousemmenagogueencephalousendocardiumendocraniumendometriumendotheciumendotheliumenterovirusepigastrium

About this list

Words
13 (4 common words)
Common example
efficacious
Rare example
epigastrium
Doubled letters
2
Ending in S
4
Most frequent letter
I (11)

Questions

How many 11-letter words matching e________u_ are there?

13. 4 of them are common words.

What is a common example?

EFFICACIOUS is among the common words in this set.