13-Letter Words Matching _________O__N

There are 15 13-letter words that match _________O__N. 6 are common words, such as ASSEMBLYWOMAN and ASSEMBLYWOMEN. A rarer one is PHYTOPATHOGEN. In this set, E is the most frequent open letter (12 words). 6 words contain a doubled letter.

Full list 15

assemblywomanassemblywomenbusinesswomanbusinesswomencongresswomancongresswomenmastigophoranmethemoglobinorthohydrogenbildungsromancephalosporincorticotropinnoncarcinogenoxyhemoglobinphytopathogen

About this list

Words
15 (6 common words)
Common example
assemblywoman
Rare example
phytopathogen
Doubled letters
6
Ending in S
0
Most frequent letter
E (12)

Questions

How many 13-letter words matching _________o__n are there?

15. 6 of them are common words.

What is a common example?

ASSEMBLYWOMAN is among the common words in this set.