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Yes, onium is playable

...and is worth 10 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Onium" Definition

noun

Any cation derived by the addition of a proton to the hydride of any element of the nitrogen, chalcogen or halogen families.
Source: Wiktionary
Any organic derivative of these compounds.
Source: Wiktionary
The bound pair of a particle and its antiparticle.
Source: Wiktionary

adjective

Being or characterized by a usually complex cation.
Attributive Designating (compounds containing) complex cations of the kind with names ending in -onium.

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