13-Letter Words Matching ______S_T____

There are 22 13-letter words that match ______S_T____. 8 are common words, such as CIVILISATIONS and COMPENSATIONS. A rarer one is URBANISATIONS. In this set, I is the most frequent open letter (22 words). 3 words contain a doubled letter.

Full list 22

civilisationscompensationscondensationsconversationsdispensationsdisquisitionsintransitivesradioisotopesmalversationsreimpositionsthermosettingboddhisattvascolonisationsditransitivesinspissationsoptimisationsorganisationspostpositionsradioisotopicunionisationsunparasitizedurbanisations

About this list

Words
22 (8 common words)
Common example
civilisations
Rare example
urbanisations
Doubled letters
3
Ending in S
19
Most frequent letter
I (22)

Questions

How many 13-letter words matching ______s_t____ are there?

22. 8 of them are common words.

What is a common example?

CIVILISATIONS is among the common words in this set.