13-Letter Words Matching ___O___B_____

There are 18 13-letter words that match ___O___B_____. 2 are common words, such as IMPOSSIBILITY and NEGOTIABILITY. A rarer one is SECOBARBITALS. In this set, I is the most frequent open letter (17 words). 2 words contain a doubled letter.

Full list 18

impossibilitynegotiabilityaffordabilityautostabilityexportabilityresolvabilityunsociabilityunworkabilityabsorbabilitycytomembranesendosymbiontsendosymbiosesendosymbiosisendosymbiotichexobarbitalsinsociabilityreformabilitysecobarbitals

About this list

Words
18 (2 common words)
Common example
impossibility
Rare example
secobarbitals
Doubled letters
2
Ending in S
6
Most frequent letter
I (17)

Questions

How many 13-letter words matching ___o___b_____ are there?

18. 2 of them are common words.

What is a common example?

IMPOSSIBILITY is among the common words in this set.