15-Letter Words Matching ___UN__________

There are 22 15-letter words that match ___UN__________. 2 are common words, such as GROUNDBREAKINGS and IMMUNODEFICIENT. A rarer one is VOLUNTARINESSES. In this set, I is the most frequent open letter (22 words). 15 words contain a doubled letter.

Full list 22

groundbreakingsimmunodeficientimmunochemistryimmunoglobulinsimmunologicallyinfundibuliformbraunschweigersimmunoassayableimmunoblottingsimmunocompetentimmunodiagnosesimmunodiagnosisimmunodiffusionimmunomodulatorimmunopathologyimmunotherapiesnonuniformitiesnonuniquenessesnonuniversitiesrefundabilitiesunpunctualitiesvoluntarinesses

About this list

Words
22 (2 common words)
Common example
groundbreakings
Rare example
voluntarinesses
Doubled letters
15
Ending in S
13
Most frequent letter
I (22)

Questions

How many 15-letter words matching ___un__________ are there?

22. 2 of them are common words.

What is a common example?

GROUNDBREAKINGS is among the common words in this set.