prodigious vs colossal

prodigious and colossal both are adjectives.

Word	Noun	Adjective	Verb	Adverb
prodigious	No	Yes	No	No
colossal	No	Yes	No	No

As adjectives, prodigious and colossal are synonyms defined as:

prodigious and colossal: so great in size or force or extent as to elicit awe

Other synonyms of prodigious include stupendous.

prodigious (adjective)	colossal (adjective)
far beyond what is usual in magnitude or degree	so great in size or force or extent as to elicit awe
so great in size or force or extent as to elicit awe
of momentous or ominous significance