plenteous vs copious

plenteous and copious both are adjectives.

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

As adjectives, plenteous and copious are synonyms defined as:

Other synonyms of plenteous include ample, plentiful, rich.

plenteous (adjective)	copious (adjective)
affording an abundant supply	affording an abundant supply
	large in number or quantity (especially of discourse)