13-Letter Words Matching __T_________M

There are 12 13-letter words that match __T_________M. 3 are common words, such as ANTICOMMUNISM and ANTILOGARITHM. A rarer one is INTERFEROGRAM. In this set, I is the most frequent open letter (12 words). 2 words contain a doubled letter.

Full list 12

anticommunismantilogarithmrutherfordiumactinouraniumanticlinoriumantiterrorismautoeroticismcatastrophismantinomianismantiritualismautoradiograminterferogram

About this list

Words
12 (3 common words)
Common example
anticommunism
Rare example
interferogram
Doubled letters
2
Ending in S
0
Most frequent letter
I (12)

Questions

How many 13-letter words matching __t_________m are there?

12. 3 of them are common words.

What is a common example?

ANTICOMMUNISM is among the common words in this set.