If you don't like what module sets in it's
hook_menu(), alter it with your own
hook_menu_alter(). Example code:
// Copy search to another place
$items['look'] = $items['search'];
// remove all old search settings
// optional if you will also follow next step
// add your menu item below instead of usual hook_menu
$items['search'] = array(
This will unset /search path, and move all it's settings to /look path.
Worth noting is that if module generates links to /search anyway, it means it has it hardcoded somewhere. Happens. If so, you need
hook_form_alter() or it's analogue to alter also these links.