The names of the Shisha Sidrei Mishna (Six Orders of Mishnah) are: Zeraim, Moed, Nashim, Nezikim, Kodshim, Taharos. All of them besides Moed are in plural form. However Moed is in singular form. Why ...
Why are some masechtot names plural (e.g. gitin, kidushin) while others are singular (e.g. tomid, nida and shabos)?