difference and similarity between eraser and liquid paper

similarity & difference:
        Both of them can remove or cover your mistake. But eraser can only erase your pencil writing on paper. Liquid paper can coat your every words what ever it's pencil writing or pen writing, but liquid paper is more use for some nonerasable pens, like ball point pen, pen, marker. Sometimes, it will makes you feel accurate if you use liquid paper to alter your mistake with your pencil writing, because pencil is erasable, you just need to use your eraser to wipe it off. Both of them having chemical raw materials, but I think liquid paper's chemical composition is more harmful human body. Because when you using it, Most of liquid papers will volatilize their chemical composition in your breath, and it smells like paint or varnish. Conversely, erasers aren't like that bad, eraser's chemical raw only keep it not decay, enhanced their durability, it doesn't harmful human healthy.