15-Letter Words Matching __________ER___

There are 23 15-letter words that match __________ER___. 3 are common words, such as CONFECTIONERIES and COUNTEROFFERING. A rarer one is UNFOSSILIFEROUS. In this set, I is the most frequent open letter (22 words). 7 words contain a doubled letter.

Full list 23

confectioneriescounterofferingsledgehammeringanticholinergicergocalciferolsmischaracterizeoverconsideratepharmacotherapystereoisomerismarchaebacteriumcarpetbaggeriescorynebacterialcorynebacteriumcounterorderingenterobacterialenterobacteriummountebankeriesnincompooperiesoverengineeringphrasemongeringpsychosurgeriesschoolmasterishunfossiliferous

About this list

Words
23 (3 common words)
Common example
confectioneries
Rare example
unfossiliferous
Doubled letters
7
Ending in S
7
Most frequent letter
I (22)

Questions

How many 15-letter words matching __________er___ are there?

23. 3 of them are common words.

What is a common example?

CONFECTIONERIES is among the common words in this set.