As verbs the difference between splaining and plaining
is that splaining is present participle of splain while plaining is present participle of lang=en.
As a noun plaining is
a lamentation.
plaining
English
Verb
(head)
Noun
(
en noun)
A lamentation.
* 1592? , William Shakespeare, The Comedy of Errors
- And piteous plainings of the pretty babes, That mourn'd for fashion, ignorant what to fear...