13-Letter Words Matching L_____O______

There are 12 13-letter words that match L_____O______. 7 are common words, such as LABORIOUSNESS and LECHEROUSNESS. A rarer one is LIGHTSOMENESS. 8 words contain a doubled letter.

Full list 12

laboriousnesslecherousnesslitigiousnessloathsomenessludicrousnessluncheonettesluxuriousnesslaryngoscopeslaryngologieslichenologieslichenologistlightsomeness

About this list

Words
12 (7 common words)
Common example
laboriousness
Rare example
lightsomeness
Doubled letters
8
Ending in S
11

Questions

How many 13-letter words matching l_____o______ are there?

12. 7 of them are common words.

What is a common example?

LABORIOUSNESS is among the common words in this set.