15-Letter Words Matching _____DE________

There are 13 15-letter words that match _____DE________. 3 are common words, such as CONFIDENTIALITY and CONSIDERATENESS. A rarer one is ULTRADEMOCRATIC. In this set, I is the most frequent open letter (12 words). 3 words contain a doubled letter.

Full list 13

confidentialityconsideratenessinterdependenceimponderabilityinterdependencycomradelinessesnonindependencenovemdecillionsoligodendrocyteoligodendrogliaoveridentifyingphotodegradableultrademocratic

About this list

Words
13 (3 common words)
Common example
confidentiality
Rare example
ultrademocratic
Doubled letters
3
Ending in S
3
Most frequent letter
I (12)

Questions

How many 15-letter words matching _____de________ are there?

13. 3 of them are common words.

What is a common example?

CONFIDENTIALITY is among the common words in this set.