15-Letter Words Matching ____O_________L

There are 32 15-letter words that match ____O_________L. 4 are common words, such as IMPROVISATIONAL and MICROBIOLOGICAL. A rarer one is SOCIOHISTORICAL. In this set, A is the most frequent open letter (31 words). 2 words contain a doubled letter.

Full list 32

Common words

improvisationalmicrobiologicalnongovernmentaltrigonometricalimprovisatorialmicrosporophyllnonconfidentialnonconventionalpaleontologicalphotoelectricalphotomechanicalpiezoelectrical
improvisationalmicrobiologicalnongovernmentaltrigonometricalimprovisatorialmicrosporophyllnonconfidentialnonconventionalpaleontologicalphotoelectricalphotomechanicalpiezoelectricalservomechanicalsociobiologicalethnohistoricalhydrobiologicalhydromechanicalintrospectionalmacrostructuralmicroanalyticalmicroanatomicalmicrostructuralneuroanatomicalneurobiologicalpaleobiologicalpaleoecologicalpaleozoologicalphotobiologicalphotogeologicalradiobiologicalretroperitonealsociohistorical

About this list

Words
32 (4 common words)
Common example
improvisational
Rare example
sociohistorical
Doubled letters
2
Ending in S
0
Most frequent letter
A (31)

Questions

How many 15-letter words matching ____o_________l are there?

32. 4 of them are common words.

What is a common example?

IMPROVISATIONAL is among the common words in this set.