Nomzo is being very generous with those valuations I think (both site and domain - especially considering we know nothing about site traffic or revenue - and Alexa just 450k, only 211 indexed pages).
Those would definitely be the very top end of the reseller range I think, if not ever higher than that, unless the site makes $4,000+ per month.
Domain based upon Google search results and the fact that it is a .com - I would say it is in the mid xx to low xxx range - however this is a one word dictionary .com so it will command a premium over that - though I can't see more than mid to high xxx, domain only, USD, reseller.
It is one of the category killer domains for sure, but the niche just doesn't seem very popular - none of the terms gets a great deal of exact searches - though the EPC is pretty good for most of them.