Is there a way to add terms for the Spell Checker in editor to reference?
Checkout the following modules:

Wysiwyg SpellCheck 


  Wysiwyg SpellCheck module is a plugin for wysiwyg editor that enables TinyMCE spellchecker plugin.


Spell Checker


  This module supports spell checking of node content (including title, body and CCK fields).


Image from project page.