15-Letter Words Matching _E________R____

There are 14 15-letter words that match _E________R____. 3 are common words, such as GEOENGINEERINGS and SEPTUAGENARIANS. A rarer one is XERORADIOGRAPHY. In this set, A is the most frequent open letter (13 words). 1 words contain a doubled letter.

Full list 14

geoengineeringsseptuagenarianstelephotographycephalochordatemercaptopurinestelephotographsweatherboardingcephalothoracescephalothoraxesmethoxyfluranespectinesterasessemicylindricalsemipornographyxeroradiography

About this list

Words
14 (3 common words)
Common example
geoengineerings
Rare example
xeroradiography
Doubled letters
1
Ending in S
8
Most frequent letter
A (13)

Questions

How many 15-letter words matching _e________r____ are there?

14. 3 of them are common words.

What is a common example?

GEOENGINEERINGS is among the common words in this set.