13-Letter Words Starting With DEF

There are 18 13-letter words that start with DEF. 5 are common words, such as DEFECTIVENESS and DEFENSELESSLY. A rarer one is DEFORMATIONAL. 7 words contain a doubled letter.

Full list 18

defectivenessdefenselesslydefensivenessdeferentiallydeforestationdefenestrateddefensibilitydefibrillatordefeasibilitydefenestratesdefervescencedefibrillateddefibrillatesdefibrinatingdefibrinationdeflagrationsdeformalizingdeformational

About this list

Words
18 (5 common words)
Common example
defectiveness
Rare example
deformational
Doubled letters
7
Ending in S
5

Questions

How many 13-letter words starting with def are there?

18. 5 of them are common words.

What is a common example?

DEFECTIVENESS is among the common words in this set.