15-Letter Words Matching _____O_____S___

There are 13 15-letter words that match _____O_____S___. 2 are common words, such as EQUIVOCALNESSES and OUTSPOKENNESSES. A rarer one is OVERCOMPRESSING. In this set, I is the most frequent open letter (12 words). 8 words contain a doubled letter.

Full list 13

equivocalnessesoutspokennessesactinochemistrybiogeochemistryimmunochemistrymillionairessesstereochemistrythermochemistryantiforeclosureeasygoingnessesimmunodiffusionoutdoorsmanshipovercompressing

About this list

Words
13 (2 common words)
Common example
equivocalnesses
Rare example
overcompressing
Doubled letters
8
Ending in S
4
Most frequent letter
I (12)

Questions

How many 15-letter words matching _____o_____s___ are there?

13. 2 of them are common words.

What is a common example?

EQUIVOCALNESSES is among the common words in this set.