What's a big-vocabulary word for someone with a big vocabulary?

What's a big-vocabulary word for someone with a big vocabulary?

I'd like to say I'm looking for a "_____".

Solution 1:

A lexicomane?  Literally: someone who’s mad about dictionaries…

This seems to be too new and/or marginal a coinage to appear in the major dictionaries yet; but it’s made from standard parts, and made well, so should be easily comprehensible (certainly by any big-vocabulary-person), and seems to be gaining quite a bit of currency (googling it reveals plenty of use). On Wordnik.

Solution 2:

I dunno, I kinda like Thesaurus Rex

Solution 3:

I was going to suggest sesquipedalian — which is certainly a big word, although perhaps not as precisely aligned with an extensive vocabulary as lexicomane (other than by inference). Still, I'm unsure that PLL's call is the right one.

Solution 4:

Vocabularian has the advantage of being quite adequately hoity-toity while also reasonably clear.