As far as I can tell, research components will drop off of any mob that is at least the level of the spell the research components make. For example: The level 24 necro spell Haunting Corpse requires words of allure. The words of allure will drop off any monster that is lvl 24-29. Some mobs don't drop research components though. The gnolls in paw are one example. Some words are an exception to this too. Words of Burnishing are only used for the lvl 44 necro spell Dead Man Floating but they drop in the 20s.
Also, if you're looking for the lvl 29 necro pet spell that uses words of haunting, you can find that pet spell in a SK guild.
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