10-Letter Words Matching _____PS___

There are 18 10-letter words that match _____PS___. 5 are common words, such as COLLAPSING and DYSPEPSIAS. A rarer one is TEACUPSFUL. In this set, I is the most frequent open letter (17 words). 2 words contain a doubled letter.

Full list 18

collapsingdyspepsiasepilepsiespalimpsestprolapsingeclampsiasnecropsiesoligopsonytherapsidsamylopsinsassumpsitscathepsinsdyspepsieshydropsiesincorpsingnecropsiedrhodopsinsteacupsful

About this list

Words
18 (5 common words)
Common example
collapsing
Rare example
teacupsful
Doubled letters
2
Ending in S
11
Most frequent letter
I (17)

Questions

How many 10-letter words matching _____ps___ are there?

18. 5 of them are common words.

What is a common example?

COLLAPSING is among the common words in this set.