Reference for irregular plurals?

I have found a number of online dictionaries/translators, but have not yet found one that lists plural forms of nouns and adjectives directly. So far I have had some luck by guessing and doing internet searches on what I suppose the plural form would be, but it would be nice to have a go-to single source. Any suggestions?

December 14, 2016

December 15, 2016

Perfect! : )

December 15, 2016
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