Depending on the word's gendre itself.
Exp for feminin gendre: ספינה (boat), ספינות(boats). משאית(truck), משאיות(trucks). So if you noticed every "NOUN" that ends with a "ה" or "ת" is "feminin" and its plural is the same word, removing "ה/ת", and replacing it with "ות".
BUT there are irregular feminin plurals exp: אשה/נשים samely like "english: woman/women" and "arabic: انثىאנשא/نساءנשאא".
The rest is the only remaing gendre wich is masculin that doesnt have a specefic ending in its singular form but it does in its plural one that is mainly "ים"