15-Letter Words Starting With SO

There are 18 15-letter words that start with SO. 3 are common words, such as SOLIDIFICATIONS and SOPHISTICATIONS. A rarer one is SOMNAMBULATIONS. 5 words contain a doubled letter.

Full list 18

solidificationssophisticationssorrowfulnessessocialisticallysociobiologicalsociobiologistssociolinguisticsoftheartednesssolipsisticallysophisticatedlysoutheastwardlysouthwestwardlysocioculturallysociohistoricalsolderabilitiessolitudinarianssolubilizationssomnambulations

About this list

Words
18 (3 common words)
Common example
solidifications
Rare example
somnambulations
Doubled letters
5
Ending in S
9

Questions

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

18. 3 of them are common words.

What is a common example?

SOLIDIFICATIONS is among the common words in this set.