plentiful vs ample

plentiful and ample both are adjectives.

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

As adjectives, plentiful and ample are synonyms defined as:

Other synonyms of plentiful include copious, plenteous, rich.

plentiful (adjective)	ample (adjective)
producing in abundance	more than enough in size or scope or capacity
affording an abundant supply	affording an abundant supply
existing in great number or quantity	fairly large in size