May I add :-

sorry, I’m sorry and

forgive me, please forgive me

to the list of words in this category. I think in everyday talks ‘sorry’, ‘excuse me’ and ‘forgive me’ are used quite often.

PS. “mea culpa” is Latin for (simply) “my fault” (admitting blame). But “mega culpa” is a slang for “a very big [f.. up] fault” (unbelievable but true). ;-)