The difference between Planet and World
When used as nouns, planet means each of the seven major bodies which move relative to the fixed stars in the night sky—the moon, mercury, venus, the sun, mars, jupiter and saturn, whereas world means human collective existence.
World is also verb with the meaning: to consider or cause to be considered from a global perspective.
check bellow for the other definitions of Planet and World
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Planet as a noun (now, historical, or, astrology):
Each of the seven major bodies which move relative to the fixed stars in the night sky—the Moon, Mercury, Venus, the Sun, Mars, Jupiter and Saturn.
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Planet as a noun (astronomy):
A body which orbits the Sun directly and is massive enough to be in hydrostatic equilibrium (effectively meaning a spheroid) and to dominate its orbit; specifically, the eight major bodies of Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. (Pluto was considered a planet until 2006 and has now been reclassified as a dwarf planet.)
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Planet as a noun:
A large body which directly orbits any star (or star cluster) but which has not attained nuclear fusion.
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Planet as a noun:
In phrases such as the planet, this planet, sometimes refers to the Earth.
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World as a noun (with "the"):
Human collective existence; existence in general.
Examples:
"There will always be lovers, till the world’s end."
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World as a noun:
The .
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World as a noun (uncountable, with "the"):
The .
Examples:
"People are dying of starvation all over the world."
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World as a noun (countable):
A , especially one which is or . Any other which many be inhabitable, such as a .
Examples:
"Our mission is to travel the galaxy and find new worlds."
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World as a noun:
A very large extent of country.
Examples:
"the [[New World]]"
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World as a noun (fiction, speculation):
A , such as , containing one or multiple of , specially intelligent ones.
Examples:
"the world of Narnia''; ''the Wizarding World of Harry Potter''; ''a zombie world"
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World as a noun:
An individual or group or setting.
Examples:
"In the world of boxing, good diet is all-important."
"Welcome to my world."
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World as a noun (computing):
The part of an operating system distributed with the kernel, consisting of the shell and other programs.
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World as a noun (tarot):
The twenty-second trump or major arcana card of the tarot.
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World as a noun (informal):
A great amount.
Examples:
"Taking a break from work seems to have done her a world of good."
"You're going to be in a world of trouble when your family finds out."
"a world of difference; a world of embarrassment"
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World as a noun (archaic):
Age, era
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World as a verb:
To consider or cause to be considered from a global perspective; to consider as a global whole, rather than making or focussing on national or other distinctions; compare globalise.
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World as a verb:
To make real; to make worldly.