The difference between Armchair and Sofa
When used as nouns, armchair means a chair with supports for the arms or elbows, whereas sofa means a raised area of a building's floor, usually covered with carpeting, used for sitting.
Armchair is also adjective with the meaning: remote from actual involvement, including a person retired from previously active involvement.
check bellow for the other definitions of Armchair and Sofa
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Armchair as a noun:
A chair with supports for the arms or elbows.
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Armchair as an adjective (figuratively):
Remote from actual involvement, including a person retired from previously active involvement.
Examples:
"These days I'm an armchair detective."
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Armchair as an adjective (figuratively):
Unqualified or uninformed but yet giving advice, especially on technical issues, such as law, architecture, medicine, military theory, or sports.
Examples:
"He's just an armchair lawyer who thinks he knows a lot about the law because he reads a legal [[blog]] on the internet."
"After the American football game, the armchair [[quarterback]]s talked about what they would have done differently to win, if they had been star athletes instead of out-of-shape old men."
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Sofa as a noun (Middle East, _, architecture, archaic):
A raised area of a building's floor, usually covered with carpeting, used for sitting.
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Sofa as a noun (furniture):
An upholstered seat with a raised back and one or two raised ends, long enough to comfortably accommodate two or more people.