15-Letter Words Matching ___________IN__

There are 40 15-letter words that match ___________IN__. 10 are common words, such as BACKSCRATCHINGS and FEATHERBEDDINGS. A rarer one is WHISTLEBLOWINGS. In this set, S is the most frequent open letter (39 words). 13 words contain a doubled letter.

Full list 40

Common words

backscratchingsfeatherbeddingsfortunetellingsgeoengineeringsgroundbreakingsmountaineeringsnitroglycerinesphotoengravingsphotofinishingsteleprocessingsazidothymidinesbioengineerings
backscratchingsfeatherbeddingsfortunetellingsgeoengineeringsgroundbreakingsmountaineeringsnitroglycerinesphotoengravingsphotofinishingsteleprocessingsazidothymidinesbioengineeringschlorpromazineshexylresorcinolmercaptopurinesnorepinephrinesbackscatteringsbenzodiazepinescholecystokinincholestyraminescountershadingscyproheptadineselectrofishingselectrowinningsfingerprintingshydroxyprolinesimmunoblottingsmethylxanthinesnonengineeringsnonoverlappingsorganochlorinesoverentertainedpararosanilinesphthalocyaninesrumormongeringssilversmithingssteeplechasingsstrikebreakingswappenschawingswhistleblowings

About this list

Words
40 (10 common words)
Common example
backscratchings
Rare example
whistleblowings
Doubled letters
13
Ending in S
37
Most frequent letter
S (39)

Questions

How many 15-letter words matching ___________in__ are there?

40. 10 of them are common words.

What is a common example?

BACKSCRATCHINGS is among the common words in this set.