The difference between Metro and Tube
When used as nouns, metro means an underground railway, whereas tube means anything that is hollow and cylindrical in shape.
Metro is also adjective with the meaning: metropolitan.
Tube is also verb with the meaning: to make or use tubes.
check bellow for the other definitions of Metro and Tube
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Metro as a noun:
An underground railway.
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Metro as a noun:
A train that runs on such an underground railway.
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Metro as a noun:
An urban rapid transit light railway
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Metro as a noun:
A train that runs on such a railway.
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Metro as a noun:
a metropolitan area
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Metro as an adjective:
metropolitan
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Tube as a noun:
Anything that is hollow and cylindrical in shape.
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Tube as a noun:
An approximately cylindrical container, usually with a crimped end and a screw top, used to contain and dispense semiliquid substances.
Examples:
"A tube of toothpaste."
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Tube as a noun (British, colloquial, often capitalized as [[Tube]]):
The London Underground railway system, originally referred to the lower level lines that ran in tubular tunnels as opposed to the higher ones which ran in rectangular section tunnels. (Often the tube.)
Examples:
"I took the tube to Waterloo and walked the rest of the way."
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Tube as a noun (Australia, slang):
A tin can containing beer (or other beverage?).
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Tube as a noun (surfing):
A wave which pitches forward when breaking, creating a hollow space inside.
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Tube as a noun (North America, colloquial):
A television. Also, derisively, boob tube. British: telly.
Examples:
"Are you just going to sit around all day and watch the tube?"
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Tube as a noun (Scotland):
Idiot.
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Tube as a verb:
To make or use tubes
Examples:
"She tubes lipstick."
"They tubed down the Colorado River."
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Tube as a verb (medicine, colloquial):
To intubate
Examples:
"patient is tubed'"