[quote=Marik]
Dude, English was my best subject and I’m a fucking writer, what am I supposed to do now? I can’t continue on after this. I gotta move to a different country now and start over as a locksmith or something. But really, the word hider gets used so little in my life that I completely forgot that it was even a word. How would you even use it? The hider shrouded himself in the dark alleyway?
[/quote]

Does it even matter if you can hardly use the word elsewhere? I've only ever seen the word "hider" in a forum context - but that doesn't matter, because its pronunciation seems implied based on the fact that it hides things. 

Also, just the fact that there's only one D would indicate that it's pronounced "hide-er". If it was "hid-er" it would most likely be spelled "hidder". It's like the difference between "rapping" and "raping".