15-Letter Words Matching ________S___O__

There are 17 15-letter words that match ________S___O__. 2 are common words, such as PREDISPOSITIONS and PRESUPPOSITIONS. A rarer one is WESTERNISATIONS. In this set, I is the most frequent open letter (17 words). 1 words contain a doubled letter.

Full list 17

predispositionspresuppositionsaftersensationsneurophysiologytergiversationsaxiomatisationscontrapositionsdecompensationsgeneralisationshistophysiologyhomogenisationslexicalisationsmicropulsationspathophysiologypolymerisationsspecialisationswesternisations

About this list

Words
17 (2 common words)
Common example
predispositions
Rare example
westernisations
Doubled letters
1
Ending in S
14
Most frequent letter
I (17)

Questions

How many 15-letter words matching ________s___o__ are there?

17. 2 of them are common words.

What is a common example?

PREDISPOSITIONS is among the common words in this set.