i cannot differentiate writing instruction from writing direction

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whew! i am having a tough time now. i thought i already finished my report in scientific writing about writing instruction and writing direction. i cannot differentiate these two. i just figured it out that i gave meaning to the oral giving of direction. but literally, instruction - from the word instruct and direction which came from direct. they are synonyms and i guess, direct being used to direct you what to do. for example in taking an examination, there is a direction given there. if you will just shade or choose the letter which gives the correct answer. and the instructions like wearing a life jacket or baking a cake. for sure, someone will direct you where to go, when you do not know the place you visited and when you are making a science investigatory project, you have been instructed what to do. but what about taking a medicine - what you follow? direction or instruction. still confuse - help me figure it out