15-Letter Words Matching _S__________S__

There are 13 15-letter words that match _S__________S__. 3 are common words, such as ASSERTIVENESSES and ASSIDUOUSNESSES. A rarer one is PSYCHOSYNTHESIS. In this set, S is the most frequent open letter (13 words). 6 words contain a doubled letter.

Full list 13

assertivenessesassiduousnessesastrophysicistsassociationismsessentialnessespsychodiagnosispsycholinguistsassociationistsastrobiologistsestimablenessespseudomorphismspsychosynthesespsychosynthesis

About this list

Words
13 (3 common words)
Common example
assertivenesses
Rare example
psychosynthesis
Doubled letters
6
Ending in S
13
Most frequent letter
S (13)

Questions

How many 15-letter words matching _s__________s__ are there?

13. 3 of them are common words.

What is a common example?

ASSERTIVENESSES is among the common words in this set.