Pool of light - a security device used by Hozse Atreides.
Saguaro - plant on Arrakis
Suspensor Palanquin - a means of Transport on Arrakis.
Reed-man - a Waterman's Asssitant whose duty it is to kill a little maker to gain it's bile for the Water of life.
Space-liner - a type of Guild Spaceship
Silverwall - a type of fortification at Arrakeen.
slow stunner - type of weapon used by the Sardaukar, able to penetrate shields.
Spiked-backed dog - a type of exotic ant-eating dog native to Arrakis.
Squood - tiny animals consumed by the Harkonnens as living food
Stungun - a type of weapon us3d by Harkonnens and Atreides.
Tank-suit - type of protective clothing worm by Guildsmen
Tarpel Gun - a pistol-like weapon used by the Fremen.
Second Stage Navigators - Guildmen who appear as normal men , but with slight outer signs of mutation.They wear Tank-Suits filled with spice-gas.
Third Stage Navigator - Navigators who have reached an advanced stage of Mutation.They resemble a mix of men and large fleshy grasshoppers with huge heads and small human limbs.They can leave their Spaceships and move in large Tanks filled with orange Spice Gas.
Fourth Stage Navigator - Navigators which never leave their ships and whose appearance is generally unknown as they are hidden from sight of non-Guildmen.In truth they appear as long, pale worms wirh large heads similar to third Stage Navigators.