9-Letter Words Matching ____EI___

There are 39 9-letter words that match ____EI___. 12 are common words, such as CAFFEINES and CANOEISTS. A rarer one is THOLEIITE. In this set, S is the most frequent open letter (27 words). 10 words contain a doubled letter.

Full list 39

Common words

caffeinescanoeistsconceitedconceivedconceivesflyweightforfeitedoutweighsperceivedperceivesplebeianssurfeited
caffeinescanoeistsconceitedconceivedconceivesflyweightforfeitedoutweighsperceivedperceivesplebeianssurfeitedconceivercruzeiroscysteinesdisseizinforfeiterthereintowhereintocasteismscleveitescorbeillecroceinesdisseiseddisseisesdisseisindisseisordisseizeddisseizesditheismsditheistshygieistsmonteithsnarceinesnonbeingsperceiverproteidessurfeitertholeiite

About this list

Words
39 (12 common words)
Common example
caffeines
Rare example
tholeiite
Doubled letters
10
Ending in S
20
Most frequent letter
S (27)

Questions

How many 9-letter words matching ____ei___ are there?

39. 12 of them are common words.

What is a common example?

CAFFEINES is among the common words in this set.