Mobs
Blocks (And one item.)
Structures
Biomes
Weapons and Armor
100

These mobs have antlers and live deep down.

What are, Wardens?

100

One of the first blocks most players get in the game.

What is, Dirt?

100

These hold pigs, lots and lots of pigs.

What are, Bastions?

100

These are home to a type of ore that is green.

What are, Mountains?

100

This enchant makes you give painful hugs.

What is, Thorns?

200

These pesky creatures are a pain in tall grass.

What are, Baby Zombies?

200

This mineral in the Nether is one most won't even think of obtaining.

What is, Nether Quartz?

200

This structure has a bit of lava at the enterance.

What are, Blacksmiths?

200

This biome holds disgusting trees.

What are, Birch Forests?

200

Not an ore, but used to enchant.

What are, Bookshelfs?

300

These mobs appear when you haven't had your usual naps.

What are phantoms?

300

These blocks, recently, have the ability to make note blocks sound different.

What are, Mob Heads?

300

These structures spawn zombies and maybe spiders.

What are, Dungeons?

300

This biome has heavily guarded loot.

What are, Oceans?

300

This is one of the armor types that was removed, made of leather and iron.

What was, Plate Armor?

400

These mobs live both inside blocks and in strongholds.

What are, Silverfish?

400

This item is the best sound in minecraft.

What is, Pigstep?

400

Levitation sucks, I know.

What are, End Cities.

400

Witches.

What are Swamps?

400

These helmets obscure your view. 

What are, Carved Pumpkins?

500

These mobs have a 5% chance of spawning at the place where your ender-pearl lands.

What are, Endermites?

500

These blocks are impossible to get without commands or creative. There's three.

What are, Grass, Bedrock and Barrier Blocks?

500

These hold water and are useless.

What are, Desert Wells?

500

Least found Biome in Minecraft.

What are, Mooshroom Islands?

500

Not much protection, but movement to the max.

What are, Elytra?

M
e
n
u