15-Letter Words Matching ____O________I_

There are 30 15-letter words that match ____O________I_. 1 are common words, such as MICROELECTRONIC and ACETOPHENETIDIN. A rarer one is THYROCALCITONIN. In this set, O is the most frequent open letter (25 words). 4 words contain a doubled letter.

Full list 30

Common words

microelectronicacetophenetidinconnoisseurshipcontortionisticgluconeogenesisglyconeogenesishistoriographicphenolphthaleinradiotelephonicsociolinguisticadenohypophysisariboflavinosis
microelectronicacetophenetidinconnoisseurshipcontortionisticgluconeogenesisglyconeogenesishistoriographicphenolphthaleinradiotelephonicsociolinguisticadenohypophysisariboflavinosishistopathologiclignocellulosicmicrometeoriticneurohypophysisneuropathologicneuroscientificoligodendrogliaoutdoorsmanshippaleogeographicphenomenalisticphotoelectronicphotogrammetricphytogeographicphytopathogenicphytoplanktonicradiotelemetricsteroidogenesisthyrocalcitonin

About this list

Words
30 (1 common words)
Common example
microelectronic
Rare example
thyrocalcitonin
Doubled letters
4
Ending in S
6
Most frequent letter
O (25)

Questions

How many 15-letter words matching ____o________i_ are there?

30. 1 of them are common words.

What is a common example?

MICROELECTRONIC is among the common words in this set.