13-Letter Words Matching _N_P_________

There are 22 13-letter words that match _N_P_________. 9 are common words, such as INAPPRECIABLE and INAPPRECIABLY. A rarer one is UNSPECIFIABLE. In this set, I is the most frequent open letter (21 words). 11 words contain a doubled letter.

Full list 22

inappreciableinappreciablyinappropriateinopportunelyinspectoratesinspirationalunappealinglyunappreciatedunspectacularanaphrodisiacinopportunityunsparingnessunspecializedanaphoricallyanaphylactoidinoperculatesinspectorshipinspiritinglyinspissationsunapologizinguniparentallyunspecifiable

About this list

Words
22 (9 common words)
Common example
inappreciable
Rare example
unspecifiable
Doubled letters
11
Ending in S
4
Most frequent letter
I (21)

Questions

How many 13-letter words matching _n_p_________ are there?

22. 9 of them are common words.

What is a common example?

INAPPRECIABLE is among the common words in this set.