15-Letter Words Matching ___R______G____

There are 18 15-letter words that match ___R______G____. 4 are common words, such as MICROBIOLOGICAL and MICROBIOLOGISTS. A rarer one is NEUROBIOLOGISTS. In this set, O is the most frequent open letter (17 words). 4 words contain a doubled letter.

Full list 18

microbiologicalmicrobiologistspharmacologicalpharmacologistsmicrophotographoverbearingnessthermobarographastrobiologistsastrophotographeverlastingnesshydrobiologicalhydrobiologistsmacroaggregatedmacroaggregatesmacrophotographmicroradiographneurobiologicalneurobiologists

About this list

Words
18 (4 common words)
Common example
microbiological
Rare example
neurobiologists
Doubled letters
4
Ending in S
8
Most frequent letter
O (17)

Questions

How many 15-letter words matching ___r______g____ are there?

18. 4 of them are common words.

What is a common example?

MICROBIOLOGICAL is among the common words in this set.