big vs ample

big and ample both are adjectives.

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

big (adjective)	ample (adjective)
above average in size or number or quantity or magnitude or extent	more than enough in size or scope or capacity
conspicuous in position or importance	affording an abundant supply
given or giving freely	fairly large in size
generous and understanding and tolerant
marked by intense physical force
significant
prodigious
serious or severe
loud and firm
(of animals) fully developed
in an advanced stage of pregnancy
feeling self-importance
exhibiting self-importance