it should be ما هو الفرق بين السوداء والأسود؟ and the answer of this question is السوداء هي صفة لوصف الأنثى(شئ مؤنث) .أما الأسود صفة لوصف الذكر (شئ مذكر)

Thank you Rami.

your question is almost correct... you're just missing "ال" and "ء" so the correct one is "ما الفرق بین السوداء والأسود؟" :)

السوداء = feminine singular form of "Black" الاسود = masculine singular form of "Black" سود = plural (no gender) form of "Black" Usage of either three would all depend on the noun, in terms of gender and count (singular or plural), of which you're describing. I hope this answers your question. Best of luck!