Basic Guidelines For English Spellings
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1Forming nouns denoting an action that is completed.
2Forming nouns denoting the body concerned in an action or process.
3Forming nouns denoting the product or result of an action or process.
From French, via Portuguese, Provençal, and Spanish -ada or via Italian -ata, from Latin -atus (past participial suffix of verbs ending in -are).
Forming nouns such as decade.
Variant of -ad, from French -ade, from Greek -as, -ad-.
2Forming nouns denoting a person.
From Spanish or Portuguese -ado, masculine form of -ada (see -ade).