15-Letter Words Matching __________OR___

There are 12 15-letter words that match __________OR___. 2 are common words, such as INTERROGATORIES and PHANTASMAGORIAS. A rarer one is PSYCHOHISTORIES. 4 words contain a doubled letter.

Full list 12

interrogatoriesphantasmagoriasautotransformercontradictorilyimprovisatorialinterrogatorilycontradictoriescounterreformernoncontemporarynonprofessorialpsychohistorianpsychohistories

About this list

Words
12 (2 common words)
Common example
interrogatories
Rare example
psychohistories
Doubled letters
4
Ending in S
4

Questions

How many 15-letter words matching __________or___ are there?

12. 2 of them are common words.

What is a common example?

INTERROGATORIES is among the common words in this set.