The difference between Demon and Genius
When used as nouns, demon means an evil spirit resident in or working for hell, whereas genius means someone possessing extraordinary intelligence or skill.
Genius is also adjective with the meaning: ingenious, very clever, or original.
check bellow for the other definitions of Demon and Genius
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Demon as a noun (now, chiefly, historical):
An evil supernatural spirit. An evil spirit resident in or working for Hell; a devil. A false god or idol; a Satanic divinity. A very wicked or malevolent person; also a mischievous person, especially a child. A source (especially personified) of great evil or wickedness; a destructive feeling or character flaw. A person's fears or anxieties.
Examples:
"The demon of stupidity haunts me whenever I open my mouth."
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Demon as a noun (Greek mythology):
A neutral supernatural spirit. A person's inner spirit or genius; a guiding or creative impulse. A tutelary deity or spirit intermediate between the major Olympian gods and mankind, especially a deified hero or the entity which supposedly guided Socrates, telling him what not to do. A spirit not considered to be inherently evil; a (non-Christian) deity or supernatural being. An hypothetical entity with special abilities postulated for the sake of a thought experiment in philosophy or physics.
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Demon as a noun:
Someone with great strength, passion or skill for a particular activity, pursuit etc.; an enthusiast.
Examples:
"He’s a demon at the card tables."
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Demon as a noun (UK, card games):
A form of patience (known as in the US).
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Genius as a noun (eulogistic):
Someone possessing extraordinary intelligence or skill; especially somebody who has demonstrated this by a creative or original work in science, music, art etc.
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Genius as a noun:
Extraordinary mental capacity.
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Genius as a noun:
Inspiration, a mental leap, an extraordinary creative process.
Examples:
"a work of genius."
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Genius as a noun (Roman mythology):
The tutelary deity or spirit of a place or person.
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Genius as an adjective (informal):
ingenious, very clever, or original.
Examples:
"What a genius idea!"