prodigious vs stupendous

prodigious and stupendous both are adjectives.

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

As adjectives, prodigious and stupendous are synonyms defined as:

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

Other synonyms of prodigious include colossal.

prodigious (adjective)	stupendous (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