We don't really use it :)
I do. :-)
צדיק בסדום :)
צדיקי הדור ; )
The word סליחה (slikhah) can also be used to mean "excuse me" or "pardon me."
מצטער is a better word for sorry
How pronounce it ?
why is סליחות not accepted?
Because סליחה is the standard way of saying it. סליחות is not a very common way of saying it, so it is not a surprise they don't accept it. It's impossible to think of all the possible answers and have them listed in the database.
How many ways can you say "sorry"? It's not like there are a million different ways.