15-Letter Words Starting With OP

There are 14 15-letter words that start with OP. 2 are common words, such as OPHTHALMOLOGIES and OPHTHALMOLOGIST. A rarer one is OPTOELECTRONICS. In this set, S is the most frequent open letter (14 words). 6 words contain a doubled letter.

Full list 14

ophthalmologiesophthalmologistophthalmoscopesopisthognathousopportunenessesopenheartednessopenmouthednessoperationalismsoperationalistsoperativenessesophthalmoscopicopinionatednessopprobriousnessoptoelectronics

About this list

Words
14 (2 common words)
Common example
ophthalmologies
Rare example
optoelectronics
Doubled letters
6
Ending in S
12
Most frequent letter
S (14)

Questions

How many 15-letter words starting with op are there?

14. 2 of them are common words.

What is a common example?

OPHTHALMOLOGIES is among the common words in this set.