10-Letter Words Matching ___I_W____

There are 12 10-letter words that match ___I_W____. 4 are common words, such as CHAIRWOMAN and CHAIRWOMEN. A rarer one is SEMIDWARFS. 7 words contain a doubled letter.

Full list 12

chairwomanchairwomensatinwoodsstairwellsbrainwavesreviewablerosinweedstulipwoodschainwheeldevilwoodsfruitwoodssemidwarfs

About this list

Words
12 (4 common words)
Common example
chairwoman
Rare example
semidwarfs
Doubled letters
7
Ending in S
8

Questions

How many 10-letter words matching ___i_w____ are there?

12. 4 of them are common words.

What is a common example?

CHAIRWOMAN is among the common words in this set.