15-Letter Words Matching ___R______O____

There are 19 15-letter words that match ___R______O____. 2 are common words, such as SURREPTITIOUSLY and UNPRETENTIOUSLY. A rarer one is UNPROFESSIONALS. In this set, I is the most frequent open letter (17 words). 2 words contain a doubled letter.

Full list 19

surreptitiouslyunpretentiouslyimprovisatorialneurophysiologynitrochloroformoverambitiouslyunproportionateintraperitonealmicrogametocytemicromorphologyneuroblastomataneuropsychologypharmacognosiespharmacognosticretroperitonealsubreptitiouslythermoperiodismthyroidectomiesunprofessionals

About this list

Words
19 (2 common words)
Common example
surreptitiously
Rare example
unprofessionals
Doubled letters
2
Ending in S
3
Most frequent letter
I (17)

Questions

How many 15-letter words matching ___r______o____ are there?

19. 2 of them are common words.

What is a common example?

SURREPTITIOUSLY is among the common words in this set.