| nutrient
| noun
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| a part of a food that gives living things what they need to be healthy or to grow.
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| oak
| noun
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| a large deciduous tree that has fruit called acorns.
| Oak wood is often used for making furniture
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| oar
| noun
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| a long pole with a wide, flat end used for rowing a boat.
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| oasis
| noun
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| a place in the desert where there is water and where plants and trees can grow.
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| oats
| noun
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| a type of cereal crop grown on farms.
| Oats are used to make food and to feed cattle, horses, and other animals.
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| obey
| verb
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| to do something that someone tells or orders you to do.
| She taught the dog to obey her commands
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| object
| noun
| v1
| anything you can see or touch that isn’t alive.
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| object
| verb
| v1
| to dislike or disagree with something
| He objected to people dropping litter in the street.
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| oblong
| adjective
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| longer than it is wide, with sides nearly parallel.
| An oblong box.
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| observatory
| noun
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| a building from which people observe stars, the planets, and the weather, using powerful telescopes.
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| observe
| verb
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| to watch something
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| obstacle
| noun
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| a thing that blocks your way.
| He had to jump over 10 obstacles to win the race.
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| obstinate
| adjective
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| difficult to persuade.
| He was very obstinate and refused to pick up his room.
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| obstruct
| verb
| v1
| to block or to prevent something or someone from passing.
| She obstructed his path
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| obvious
| adjective
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| easy to see or understand.
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| occasion
| noun
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| a special event.
| The park opening was a grand occasion
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| occupation
| noun
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| the work that someone does to earn a living
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| occupy
| verb
| v1
| to be busy.
| I was occupied with my book when the doorbell rang.
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| occur
| verb
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| to happen or exist
| When did the problem occur?
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| ocean
| noun
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| a very large area of sea, usually separating continents.
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| octagon
| noun
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| a flat shape with eight straight sides
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| octopus
| noun
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| a sea animal that does not have a backbone
| e. Octopuses have eight arms, which they use for catching crabs, shellfish, and fish. They have good eyesight and are thought to have the ability to learn things.
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| odd
| adjective
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| strange or unusual.
| That’s a very odd thing to do!
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| odor
| noun
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| a strong smell
| There was a strange odor coming from the garbage.
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| offend
| verb
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| to upset or annoy someone
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| offer
| verb
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| to ask someone if they would like something, or if you can do something for them
| He offered her some grapes
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| office
| noun
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| a place where people organize and run a business
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| official
| adjective
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| properly approved by someone in charge.
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| often
| adverb
| v1
| many times
| I often go to school by bus.
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| oil
| noun
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| a thick liquid that occurs naturally underground.
| Oil is used to make products such as fuel and plastics
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