15-Letter Words Matching R___O__________

There are 34 15-letter words that match R___O__________. 8 are common words, such as RADIOACTIVITIES and RADIOTELEGRAPHS. A rarer one is RETROREFLECTORS. In this set, I is the most frequent open letter (31 words). 5 words contain a doubled letter.

Full list 34

Common words

radioactivitiesradiotelegraphsradiotelegraphyradiotelephonesradiotherapistsrationalizationrephotographingretrospectivelyradiometricallyradiomicrometerradiophotographradiotelephonic
radioactivitiesradiotelegraphsradiotelegraphyradiotelephonesradiotherapistsrationalizationrephotographingretrospectivelyradiometricallyradiomicrometerradiophotographradiotelephonicreproachfulnessreproducibilityresponsiblenessretrogressivelyradioautographsradioautographyradiobiologicalradiobiologistsradiochemicallyradioprotectionradioprotectiveradiostrontiumsradiotelemetricreasonabilitiesrechoreographedregionalizationretroactivitiesretrogradationsretroperitonealretroreflectionretroreflectiveretroreflectors

About this list

Words
34 (8 common words)
Common example
radioactivities
Rare example
retroreflectors
Doubled letters
5
Ending in S
13
Most frequent letter
I (31)

Questions

How many 15-letter words matching r___o__________ are there?

34. 8 of them are common words.

What is a common example?

RADIOACTIVITIES is among the common words in this set.