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If you are thinking of the word pneumatophore. It is a Specialized respiratory root on aquatic plants.

also pneumatophore, a specialized root structure of some swamp plants, like mangroves, which rises above the surface and serves as a respiratory organ

The scientific name for a Buttress Root is "Pneumatophore." It is a specialized root found in certain tree species in tropical forests, providing additional support and stability to the tree in shallow soils.

The Portuguese man-of-war is made up of four interconnected parts: the pneumatophore (float), tentacles, digestive polyps, and reproductive polyps. The tentacles are used for capturing prey, while the digestive and reproductive polyps help with digestion and reproduction respectively. The float allows the organism to float on the ocean's surface.