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Hello John,
I use the Oxford Greek-English Learner's Dictionary ed. D.D. Stavropoulos. (OUP ISBN 0-19-431199-6) Every word has a reference number with it which refers to one of scores of grammatical tables at the back. Every conjugation and declension is covered. To use your example, if you look up μαμά it refers you to table 17A where the pattern word is κυρά, with the plural κυράδες.
Can't go wrong, really!
Best wishes
Jim |