What's the noun for soaper? Here's the word you're looking for.
soap
(uncountable) a substance able to mix with both oil and water, used for cleaning, often in the form of a solid bar or in liquid form, derived from fats or made synthetically
“And when Snarl and soaper sit on your next play, they won't forget the lesson you have given them.”
“With her sinewy shanks and thewy thighs, the new nurse in Pine Valley Hospital on ABC's daytime soaper All My Children could easily be a professional athlete.”
“Dugmore claims Tyndale is the probable author of the anonymous The Soaper of the Lorde.”
soaproot
A perennialherb (Gypsophila struthium) whose root was formerly used as a substitute for soap.