15-Letter Words Matching ________RO_____

There are 30 15-letter words that match ________RO_____. 4 are common words, such as BURGLARPROOFING and HYPERTHYROIDISM. A rarer one is ULTRAMICROTOMES. In this set, T is the most frequent open letter (26 words). 4 words contain a doubled letter.

Full list 30

Common words

burglarproofinghyperthyroidismphilanthropistsweatherproofingcounterproposalheterochromaticheterochromatinhexachlorophenemicrosporophyllphilanthropicalphosphoproteinsphotomicrograph
burglarproofinghyperthyroidismphilanthropistsweatherproofingcounterproposalheterochromaticheterochromatinhexachlorophenemicrosporophyllphilanthropicalphosphoproteinsphotomicrographphotomicroscoperadiomicrometerthermobarographthermobarometerultramicrometerultramicroscopeapolipoproteinscorticotrophinscounterprojectscounterprotestsexoerythrocytichydroxyprolinesmicrosporocytesnonelectrolytesovercontrollingphilanthropoidstetrahydrofuranultramicrotomes

About this list

Words
30 (4 common words)
Common example
burglarproofing
Rare example
ultramicrotomes
Doubled letters
4
Ending in S
11
Most frequent letter
T (26)

Questions

How many 15-letter words matching ________ro_____ are there?

30. 4 of them are common words.

What is a common example?

BURGLARPROOFING is among the common words in this set.