Leaves are natural blocks that generate as part of trees. Source: Minecraft API

A fence gate is a block that shares the functions of both the door and the fence. Source: Minecraft API

A fence is a barrier block that cannot normally be jumped over, similar to a wall. Unlike a wall, a player (but not mobs) can see through the openings in…

A door is a block that can be used as a barrier that can be opened by hand or with redstone. Source: Minecraft API

A button is a non-solid block that can provide temporary redstone power. Source: Minecraft API

A boat is both an item and a vehicle entity used primarily for fast transport of players and passenger mobs over bodies of water. Source: Minecraft API