13-Letter Words Starting With PEN

There are 16 13-letter words that start with PEN. 5 are common words, such as PENALIZATIONS and PENETRABILITY. A rarer one is PENTAPLOIDIES. In this set, I is the most frequent open letter (14 words). 8 words contain a doubled letter.

Full list 16

penalizationspenetrabilitypenetratinglypensivenessespenuriousnesspentasyllabicpentobarbitalpenultimatelypendulousnesspenetrometerspenicillaminepenicillinasepenitentiallypennywhistlespentapeptidespentaploidies

About this list

Words
16 (5 common words)
Common example
penalizations
Rare example
pentaploidies
Doubled letters
8
Ending in S
8
Most frequent letter
I (14)

Questions

How many 13-letter words starting with pen are there?

16. 5 of them are common words.

What is a common example?

PENALIZATIONS is among the common words in this set.