14-Letter Words Matching _____R____O___

There are 20 14-letter words that match _____R____O___. 2 are common words, such as CONSTRUCTIONAL and CONVERSATIONAL. A rarer one is RESURRECTIONAL. 6 words contain a doubled letter.

Full list 20

constructionalconversationalunidirectionalconformationalconservationaldissertationalelectrodepositendocrinologicgeochronologicconfirmationalconversazioneselectroosmoseselectroosmosiselectroosmoticinsurrectionalisochromosomesnonchromosomalnondirectionalperturbationalresurrectional

About this list

Words
20 (2 common words)
Common example
constructional
Rare example
resurrectional
Doubled letters
6
Ending in S
4

Questions

How many 14-letter words matching _____r____o___ are there?

20. 2 of them are common words.

What is a common example?

CONSTRUCTIONAL is among the common words in this set.