What would the name and formula be for Mo+O+Se? I do cross-stitch and want to spell the word "moose" (for a project focusing on the animal) with squares from the periodic table and present a compound formula and name that encapsulates all three elements, Mo+O+Se, in that order. I'm not looking for strictly realistic chemistry, just a formula and a name that would work IF the compound had actually existed. The number of atoms of each element is up to you. Can you help me with a formula and a name for Molybdenum + Oxygen + Selenium?
Well, molybdenum oxysulfide is apparently a real compound with the formula $\ce{MoOS2}$ or $\ce{MoO2S}$.  Since selenium is a chalcogen and has (some) chemistry that is analogous to sulfur, I think molybdenum oxyselenide would be an appropriate choice.

More formally:


Molybdenum(IV) oxide is a compound with the formula $\ce{MoO2}$.  
Molybdenum(IV) selenide, also called molybdenum diselenide, has a formula of $\ce{MoSe2}$
Molybdenum sulfide selenide exists and has the approximate formula $\ce{MoSSe}$.


Thus, perhaps molybdenum(IV) oxide selenide would be another choice.