9-Letter Words Matching ______X_N

There are 12 9-letter words that match ______X_N. 1 are common words, such as ANTITOXIN and AFLATOXIN. A rarer one is SAXITOXIN. In this set, O is the most frequent open letter (11 words). 1 words contain a doubled letter.

Full list 12

antitoxinaflatoxinautotoxindigitoxinendotoxinpolymyxinwoadwaxenwoodwaxenantiauxincytotoxinmycotoxinsaxitoxin

About this list

Words
12 (1 common words)
Common example
antitoxin
Rare example
saxitoxin
Doubled letters
1
Ending in S
0
Most frequent letter
O (11)

Questions

How many 9-letter words matching ______x_n are there?

12. 1 of them are common words.

What is a common example?

ANTITOXIN is among the common words in this set.