أريد أن أعرف الاختلاف (الفرق) بين الفلاح و البستاني Farmer الفلاح al-fallah\al-falla7 هو الشخص الذي يعمل في الحقول hwa al-shakhs allazi ya3mal fe al-hoqool. He's the person who works in fields\farms. Gardener البستاني al-bustany هو الشخص الذي يعمل في الحدائق. hwa al-shakhs allazi ya'mal fe al-hada2k. He's the person who works in gardens.

may be you trying to say : i want to talk about the difference between farmer and gardener أرير أن أتحدث اختلافات بين الفلاح و البستان hope the native arabic will correct my translation if it's wrong! :)

The sentence is incorrect. Are you sure about the spelling of " أرير " ?? The meaning is odd here. Make sure of the spellings and then re-write it.