15-Letter Words Matching A___N__________

There are 12 15-letter words that match A___N__________. 3 are common words, such as ADMINISTRATIONS and ADVENTUROUSNESS. A rarer one is ARRONDISSEMENTS. In this set, S is the most frequent open letter (12 words). 4 words contain a doubled letter.

Full list 12

administrationsadventurousnessattentivenessesachondroplasiasactinochemistryagranulocytosesagranulocytosisantinationalistachondroplasticadrenalectomiesammonificationsarrondissements

About this list

Words
12 (3 common words)
Common example
administrations
Rare example
arrondissements
Doubled letters
4
Ending in S
9
Most frequent letter
S (12)

Questions

How many 15-letter words matching a___n__________ are there?

12. 3 of them are common words.

What is a common example?

ADMINISTRATIONS is among the common words in this set.