The difference between Greenhouse and Polytunnel
When used as nouns, greenhouse means a building used to grow plants, particularly one with large glass windows or plastic sheeting to trap heat from sunlight even in intemperate seasons or climates, whereas polytunnel means a tunnel made of polyethylene, used to grow plants that require a higher temperature and/or humidity than that which is available in the environment.
Greenhouse is also verb with the meaning: to place (plants) in a greenhouse.
check bellow for the other definitions of Greenhouse and Polytunnel
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Greenhouse as a noun:
A building used to grow plants, particularly one with large glass windows or plastic sheeting to trap heat from sunlight even in intemperate seasons or climates.
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Greenhouse as a noun:
The glass of a plane's cockpit.
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Greenhouse as a verb (transitive):
To place (plants) in a greenhouse.
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Polytunnel as a noun:
A tunnel made of polyethylene, used to grow plants that require a higher temperature and/or humidity than that which is available in the environment.