Colossal vs. Gigantic

Colossal and Gigantic Definitions
Colossal
Of great size, extent, or amount; immense.
Gigantic
Exceedingly large in size, extent, or amount, especially for its kind
A gigantic toadstool.
Colossal
Of great scope or consequence; monumental
A colossal blunder.
Gigantic
Very great in scope or importance
A gigantic mistake.
Colossal
Extremely large or on a great scale.
A single puppy can make a colossal mess.
Gigantic
Very large.
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Colossal
Amazingly spectacular; extraordinary; epic.
Gigantic
(slang) Excellent; very good or exciting.
This band is going to be gigantic.
Colossal
Of enormous size; gigantic; huge; as, a colossal statue.
Gigantic
In the manner of a giant. en
Colossal
Of a size larger than heroic. See Heroic.
Gigantic
Of extraordinary size; like a giant.
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Colossal
So great in size or force or extent as to elicit awe;
Colossal crumbling ruins of an ancient temple
Has a colossal nerve
A prodigious storm
A stupendous field of grass
Stupendous demand
Gigantic
Such as a giant might use, make, or cause; immense; tremendous; extraordinarly; as, gigantic deeds; gigantic wickedness.
When descends on the AtlanticThe giganticStrom wind of the equinox.
Gigantic
So exceedingly large or extensive as to suggest a giant or mammoth;
A gigantic redwood
Gigantic disappointment
A mammoth ship
A mammoth multinational corporation