14-Letter Words Matching ____E_____R___

There are 23 14-letter words that match ____E_____R___. 5 are common words, such as CONSERVATORIES and CONTEMPORARIES. A rarer one is SUBSECRETARIES. In this set, I is the most frequent open letter (21 words). 3 words contain a doubled letter.

Full list 23

conservatoriescontemporariesnonbelligerentpreregisteringtercentenariesconservatorialcontemporarilymisrememberingpassementeriespredestinarianscaremongeringtrapezohedronsbiotelemetriesdispensatoriesdisrememberingmagnetometriesmisregisteringnephelometriesnonsecretoriesoverexaggeratepithecanthropistonemasonriessubsecretaries

About this list

Words
23 (5 common words)
Common example
conservatories
Rare example
subsecretaries
Doubled letters
3
Ending in S
12
Most frequent letter
I (21)

Questions

How many 14-letter words matching ____e_____r___ are there?

23. 5 of them are common words.

What is a common example?

CONSERVATORIES is among the common words in this set.