13-Letter Words Matching S_____D______

There are 14 13-letter words that match S_____D______. 2 are common words, such as SPASMODICALLY and SQUALIDNESSES. A rarer one is SUPERADDITION. In this set, I is the most frequent open letter (12 words). 8 words contain a doubled letter.

Full list 14

spasmodicallysqualidnessesstipendiariessclerodermatasemisedentaryserriednessessigmoidoscopysteroidogenicstiltednessesstudiednessesstuntednessessubacidnessessubmandibularsuperaddition

About this list

Words
14 (2 common words)
Common example
spasmodically
Rare example
superaddition
Doubled letters
8
Ending in S
7
Most frequent letter
I (12)

Questions

How many 13-letter words matching s_____d______ are there?

14. 2 of them are common words.

What is a common example?

SPASMODICALLY is among the common words in this set.