13-Letter Words Starting With RAD

There are 22 13-letter words that start with RAD. 5 are common words, such as RADIOACTIVELY and RADIOACTIVITY. A rarer one is RADIOTHORIUMS. In this set, I is the most frequent open letter (22 words). 4 words contain a doubled letter.

Full list 22

radioactivelyradioactivityradiographersradiographiesradioisotopesradiationallyradioactivateradiochemicalradiogalaxiesradiolocationradiotelegramradiationlessradicalnessesradiobiologicradiochemistsradioelementsradiographingradioisotopicradiolabelingradiolabelledradionuclidesradiothoriums

About this list

Words
22 (5 common words)
Common example
radioactively
Rare example
radiothoriums
Doubled letters
4
Ending in S
10
Most frequent letter
I (22)

Questions

How many 13-letter words starting with rad are there?

22. 5 of them are common words.

What is a common example?

RADIOACTIVELY is among the common words in this set.