12-Letter Words Matching ________L_O_

There are 13 12-letter words that match ________L_O_. 2 are common words, such as SCHOOLFELLOW and VIOLONCELLOS. A rarer one is VIGINTILLION. 11 words contain a doubled letter.

Full list 13

schoolfellowvioloncelloscheckerbloomduodecillionexophthalmosmultimillionsexdecilliontredecillionviolincellosinternucleonmultibillionpunchinellosvigintillion

About this list

Words
13 (2 common words)
Common example
schoolfellow
Rare example
vigintillion
Doubled letters
11
Ending in S
4

Questions

How many 12-letter words matching ________l_o_ are there?

13. 2 of them are common words.

What is a common example?

SCHOOLFELLOW is among the common words in this set.