autocorrect dictionary

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http://www.linuxquestions.org – Starting to use Linux on an everyday basis now and i just noticed while writing an email to my job recruiter that every word i typed had a red underline. Started writing in thunderbird, and when i had to add "from, just, recieved, free" to the dictionary i quickly got annoyed and went to my gmail on firefox and the same thing was happening. I then Mounted my windows partition and copied over my resume to my desktop and opened it in Libre office 3 and it was littered with "errors" as well. Now onto the question. Is there dictionary file that you have to update or down (HowTos)