12-Letter Words Matching ____G_____S_

There are 20 12-letter words that match ____G_____S_. 7 are common words, such as IRREGARDLESS and PRIGGISHNESS. A rarer one is SLUGGARDNESS. In this set, I is the most frequent open letter (16 words). 12 words contain a doubled letter.

Full list 20

irregardlesspriggishnesssluggishnesssprightliesttelegraphistunsightliestwrongfulnessalmightinessgrudgingnessmonographistobligingnessspongioblasttelegraphesedroughtinessphragmoplastpolyglottismpolygraphistreligionlessresignednesssluggardness

About this list

Words
20 (7 common words)
Common example
irregardless
Rare example
sluggardness
Doubled letters
12
Ending in S
11
Most frequent letter
I (16)

Questions

How many 12-letter words matching ____g_____s_ are there?

20. 7 of them are common words.

What is a common example?

IRREGARDLESS is among the common words in this set.