15-Letter Words Matching ____O________A_

There are 35 15-letter words that match ____O________A_. 4 are common words, such as IMPROVISATIONAL and MICROBIOLOGICAL. A rarer one is SOCIOHISTORICAL. 1 words contain a doubled letter.

Full list 35

Common words

improvisationalmicrobiologicalnongovernmentaltrigonometricaladenocarcinomasimprovisatoriallactovegetariannonconfidentialnonconventionalpaleontologicalphotoelectricalphotomechanical
improvisationalmicrobiologicalnongovernmentaltrigonometricaladenocarcinomasimprovisatoriallactovegetariannonconfidentialnonconventionalpaleontologicalphotoelectricalphotomechanicalpiezoelectricalservomechanicalsociobiologicalethnohistoricalhydrobiologicalhydromechanicalintrospectionalmacrostructuralmicroanalyticalmicroanatomicalmicrostructuralneuroanatomicalneurobiologicalnontotalitarianpaleobiologicalpaleoecologicalpaleozoologicalphonocardiogramphotobiologicalphotogeologicalradiobiologicalretroperitonealsociohistorical

About this list

Words
35 (4 common words)
Common example
improvisational
Rare example
sociohistorical
Doubled letters
1
Ending in S
1

Questions

How many 15-letter words matching ____o________a_ are there?

35. 4 of them are common words.

What is a common example?

IMPROVISATIONAL is among the common words in this set.