I am an English teacher, with a Master of Applied Linguistics. I will be able to easily write you an explanation of the difference between these words. I can also ensure that the piece I provide to you will be free of grammatical, spelling and typographical errors. As a large part of my job is teaching English vocabulary to speakers of other languages, this task will be very easy for me. I should be able to have it done within a couple of hours, but possibly sooner. Please consider me for this job and you will not be disappointed. I can start work on it in about half an hour from now.