15-Letter Words Matching _____R___O_____

There are 20 15-letter words that match _____R___O_____. 2 are common words, such as BACTERIOLOGICAL and BACTERIOLOGISTS. A rarer one is SPECTROSCOPISTS. In this set, E is the most frequent open letter (18 words). 4 words contain a doubled letter.

Full list 20

bacteriologicalbacteriologistsconservatorshipdessertspoonfulelectrophoreseselectrophoresiselectrophoreticinspirationallyspectroscopicalcooperationistselectroacousticelectromyogramselectromyographelectrophoresedhyperresponsivehysterectomizedintegrationistsmicroradiographnoncarcinogenicspectroscopists

About this list

Words
20 (2 common words)
Common example
bacteriological
Rare example
spectroscopists
Doubled letters
4
Ending in S
7
Most frequent letter
E (18)

Questions

How many 15-letter words matching _____r___o_____ are there?

20. 2 of them are common words.

What is a common example?

BACTERIOLOGICAL is among the common words in this set.