All the three words kinda means the same thing, but I guess most of the time "moneda" means a coin. Example: ¿Me das una moneda? = Can you hand me me a coin? "dinero" is the proper way to say "money" (and the most common way from my point of view) Example: ¿Trajiste dinero? = Did you bring money with you? I'm from Mexico and here "plata" is a casual way to refer to money (because the literal meaning of plata is silver) Example: Lo siento, no tengo nada de plata = I'm sorry, I don't have any money hope this helps ^^

como tecnisismo es igual y depende del contexto.

the word plata is using in the south of America for example in Perú,Colombia,Chile. Say "plata" is like say cash, is a regional technicality, you can say hey " dame mi dinero" and mean the same thing "dame mi plata" I hope this helpfully =)

moneda = coins dinero = money plata = silver