ER
AR
IRE
EAR
AIR
100

Bert's best friend on SS

Ernie

100

A branch of the military

Army

100

Strong metal 

Iron

100

The body part you can hear with

Ear

100

A vehicle to fly in

Airplane

200

The opposite of late 

early

200

Part of the bottom of your foot 

Arch

200

A country that is known for St. Patrick's Day

Ireland

200

Put these in your ears to hear music better 

Earphones

200

How fast an aircraft moves through the air

Airspeed

300

Third planet from the sun

Earth

300

Another word for fight 

Argue 

300

Clothes are pressed on this object 

Ironing board

300

Annoyed and a little angry 

Irritated 

300

Being off the ground; carried through the air

Airborne

400

Peppermint, basil, and parsley are kinds of ...

herbs

400

A country in South America 

Argentina

400

The colored part of your eye; also a flower

Iris

400

Another word for creepy or strange

Eerie

400

Not allowing air to escape or to enter 

Airtight

500

This is a spiny marine invertebrate

Sea Urchin 

500

Another word for spider 

Arachnid

500

When something expected actually turns out to be the opposite- a free game after you already paid 

Irony

500

A method of watering crops by flooding them with a controlled amount of water

Irrigation

500

Very dry habitat, like a desert

Arid

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