13-Letter Words Matching ____L____S___

There are 14 13-letter words that match ____L____S___. 3 are common words, such as SHALLOWNESSES and SQUALIDNESSES. A rarer one is TRIPLOBLASTIC. In this set, E is the most frequent open letter (11 words). 7 words contain a doubled letter.

Full list 14

shallownessessqualidnessestrolleybussescomplexnessesparallelisticbottlebrushesceruloplasminequilibristicfamiliarisinggentlepersonskapellmeistermegaloblasticsoliloquisingtriploblastic

About this list

Words
14 (3 common words)
Common example
shallownesses
Rare example
triploblastic
Doubled letters
7
Ending in S
6
Most frequent letter
E (11)

Questions

How many 13-letter words matching ____l____s___ are there?

14. 3 of them are common words.

What is a common example?

SHALLOWNESSES is among the common words in this set.