13-Letter Words Matching _________N_A_

There are 20 13-letter words that match _________N_A_. 10 are common words, such as COMPARTMENTAL and DEVELOPMENTAL. A rarer one is PANCYTOPENIAS. In this set, E is the most frequent open letter (19 words). 6 words contain a doubled letter.

Full list 20

compartmentaldevelopmentalenvironmentalextravaganzasneurastheniasnonjudgmentaltemperamentaltercentennialtricentennialunsentimentaldecalcomaniaspremillennialquindecennialballetomaniasdeterminantalgrandparentalintercolonialmediterraneanmonophthongalpancytopenias

About this list

Words
20 (10 common words)
Common example
compartmental
Rare example
pancytopenias
Doubled letters
6
Ending in S
5
Most frequent letter
E (19)

Questions

How many 13-letter words matching _________n_a_ are there?

20. 10 of them are common words.

What is a common example?

COMPARTMENTAL is among the common words in this set.