Magic words

Voice commands will be part of the technology we will use in The Cauldron. What should these commands be? Perhaps we could consider Greek and Latin roots and derive words that way.

Action: Turning on the light

Roots: Possible voice commands:
 * Lux (meaning: light. Source: Latin)
 * Phos (meaning: light. Source: Greek, φως)
 * Lux
 * Luxo
 * Luxim
 * Phos
 * Phoso
 * Phosim

Action: Turning off a light

Root: Possible voice commands:
 * Tenebris (meaning: darkness, dark. Source: Latin)
 * Skotos (meaning: darkness, dark. Source: Greek, σκοτος)
 * Skotos
 * Skoto
 * Tenebris
 * Skobris
 * Tenetos

Action: Pouring a pint (starting the flow of beer)

Root: Possible voice commands:
 * Effundam (meaning: pour. Source: Latin)
 * Cervisiam (meaning: Beer. Source: Latin)
 * Khíno (meaning: pour, spill. Source: Greek, χύνω)
 * Bíra (meaning: Beer. Source: Greek, μπύρα)
 * Cervisum Birra

Action: Refilling a pint (starting the refilling)

Root: Possible voice commands:
 * Repleo (meaning: refill, fill up, replenish. Source: Latin)
 * Cervisiam (meaning: Beer. Source: Latin)
 * Xanayémisma (meaning: refill, replenish. Source: Greek, ξαναγέμισμα)
 * Bíra (meaning: Beer. Source: Greek, μπύρα)

Action: Turning off the fireplace (fire is extinguished in the grate)

Root: Possible voice commands:

Action: Turning on the fireplace (fire bursts into being in the grate)

Root: Possible voice commands:

Inpiration - The Spells from Harry Potter

As further inspiration, here's a list of nearly all the spells in the expanded Potterverse. I don't know the copyright rules on any of them, but if nothing else they could serve as ideas. There's a range of origins to be found to the words:
 * Latin/Greek
 * Arabic
 * Archaic English
 * 'Gobbledegooking' words