| organ
| noun
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| a musical instrument with a keyboard and large air pipes. The pipes make a noise when air is forced into them.
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| organism
| noun
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| any living animal or plant
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| organization
| noun
| v1
| a group of people with common goals or business.
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| organize
| verb
| v1
| to arrange or plan something.
| Organizing work into folders.
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| origin
| noun
| v1
| the beginning of something, or where something or someone comes from.
| The pot was of Roman origin
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| original
| adjective
| v1
| earliest or first.
| An original design
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| ornament
| noun
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| an object that is used as a decoration.
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| orphan
| noun
| v1
| someone whose parents have died.
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| ostrich
| noun
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| a tall bird from Africa that can run very fast, but cannot fly.
| Ostriches live in dry, open countryside and eat plants, fruit, insects, and small animals.
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| other
| adjective
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| the remaining one, usually of two.
| She tried on the other hat.
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| ought
| verb
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| to do something because it is necessary or should be done
| You ought to be in bed
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| out
| adverb
| v1
| away from a place or not in a place.
| The bird pulled the worm out of the ground
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| outcome
| noun
| v1
| the result of something
| What was the outcome of the football game?
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| outdoors
| adverb
| v1
| not inside a building.
| Shall we eat outdoors today?
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| outfit
| noun
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| a set of clothes worn for a particular occasion.
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| outgrow
| verb
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| to grow too big for something.
| He had outgrown his clothes.
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| outline
| noun
| v1
| a line that shows the shape of something.
| Outline of a leaf
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| outside
| noun
| v1
| a part of something that faces out
| They painted the outside of the house green.
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| oval
| noun
| v1
| a flat, round shape like a zero.
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| jtoy
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| oven
| noun
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| a space for cooking food, heating, or drying things, usually inside a stove.
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| over
| preposition
| v1
| above or across
| She threw the ball over the wall.
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| overboard
| adverb
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| over the side of a ship or boat.
| The fishermen threw their nets overboard.
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| overgrown
| adjective
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| covered in plants that have been left to grow wild.
| An overgrown garden.
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| overhear
| verb
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| to hear people talking about things accidently
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| overlap
| verb
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| to cover the edge of something.
| Fish scales overlap each other.
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| overtake
| verb
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| to catch up with and pass by
| The car overtook the truck.
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| owe
| verb
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| to have to pay back money or something else you have borrowed.
| You owe me $5.
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| owl
| noun
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| a nocturnal bird that hunts for mice and other small animals.
| Owls have good hearing and can see well in the dark. They can turn their heads around to see behind them.
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| own
| verb
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| to have something that belongs to you.
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| ox
| noun
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| a bull used for carrying or pulling things
| A zebu is a type of ox.
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