ample vs plentiful

ample and plentiful both are adjectives.

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

As adjectives, ample and plentiful are synonyms defined as:

Other synonyms of ample include copious, plenteous, rich.

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