copious vs ample

copious and ample both are adjectives.

Word	Noun	Adjective	Verb	Adverb
copious	No	Yes	No	No
ample	No	Yes	No	No

As adjectives, copious and ample are synonyms defined as:

Other synonyms of copious include plenteous, plentiful, rich.

copious (adjective)	ample (adjective)
affording an abundant supply	more than enough in size or scope or capacity
large in number or quantity (especially of discourse)	affording an abundant supply
	fairly large in size