Minecraft wiki entry for Grass_(disambiguation), associated text: Grass Block, a block with grass on top of it
Dirt Path, previously known as "Grass Path"
Seagrass, a sea variant
Fern
Large Fern
Tall Grass, a 2-block tall plant
Nylium, commonly referred to as "nether grass"
Mycelium, purple, alien-like grass that spawns in Mushroom Fields
Podzol, a block mostly found in old growth taigas and bamboo jungles