15-Letter Words Matching N_____________L

There are 20 15-letter words that match N_____________L. 5 are common words, such as NONDEPARTMENTAL and NONGOVERNMENTAL. A rarer one is NONPROFESSORIAL. 4 words contain a doubled letter.

Full list 20

nondepartmentalnongovernmentalnonintellectualnonoccupationalnonprofessionalnonagriculturalnonconfidentialnonconventionalnonexperimentalnonhierarchicalneuroanatomicalneurobiologicalnonastronomicalnonbiographicalnoninflectionalnoninsecticidalnoninstrumentalnonmathematicalnonmetaphoricalnonprofessorial

About this list

Words
20 (5 common words)
Common example
nondepartmental
Rare example
nonprofessorial
Doubled letters
4
Ending in S
0

Questions

How many 15-letter words matching n_____________l are there?

20. 5 of them are common words.

What is a common example?

NONDEPARTMENTAL is among the common words in this set.