I'll see your parallax and raise you a parallelepiped, which scores well for spelling, pronunciation, and meaning.

I admit I've never actually seen its adjective parallelepipedal but I offer it from my reserve stock anyway.

Then there's:-

Burkism, Cranioclasm, Gloppen, Gnof, Hagseed, Jackpudding, Kecklish, Malashaganay, Metemptosis, Outpassion, Pectoriloquous, Splanchnotomy, Surquidry, Unseven, Vomiturition