13-Letter Words Matching ____O____O___

There are 69 13-letter words that match ____O____O___. 8 are common words, such as NONVOCATIONAL and PREPOSITIONAL. A rarer one is SPIROCHETOSES. In this set, I is the most frequent open letter (53 words). 7 words contain a doubled letter.

Full list 69

Common words

nonvocationalprepositionalpropositionalpropositionedradioisotopessocioeconomictestosteronesthoroughgoingandrosteronesanisometropiacompositionalconnotational
nonvocationalprepositionalpropositionalpropositionedradioisotopessocioeconomictestosteronesthoroughgoingandrosteronesanisometropiacompositionalconnotationalconvocationaldispositionalhydrocarbonicleptospirosesleptospirosismacroeconomicmicroeconomicmispositionedorthohydrogenpaleontologicpathoneurosisphotocathodesphotocomposerphytohormonessalmonellosessalmonellosissiphonophoresspirochetosissuppositionalthoroughwortsyellowthroatsanisometropicbenzophenonescollocationalethnohistoricexplorationalfibrosarcomashydrocolloidshydroquinonesmicrobiologicmicrocosmosesmyelofibrosesmyelofibrosismyelofibroticneuroanatomicneurofibromasneurohormonalneurohormonesorthopteroidsosteosarcomasovipositionalpaleobiologicpaleoecologicpathognomonicphotobiologicphotocomposedphotocomposesphotogeologicphotoperiodicphytopathogenplerocercoidsprevocationalprotohistoricradiobiologicradioisotopicreprovisionedspirochetoses

About this list

Words
69 (8 common words)
Common example
nonvocational
Rare example
spirochetoses
Doubled letters
7
Ending in S
28
Most frequent letter
I (53)

Questions

How many 13-letter words matching ____o____o___ are there?

69. 8 of them are common words.

What is a common example?

NONVOCATIONAL is among the common words in this set.