Plenty
Part of speech: noun
Definition: An adequate amount.
Part of speech: adverb
Definition: Sufficiently or very.
Part of speech: adjective
Definition: plentiful
Example sentence: There are plenty of difficult obstacles in your path. Don't allow yourself to become one of them.
Enough
Part of speech: adverb
Definition: sufficiently
Part of speech: determiner
Definition: sufficient; all that is required, needed, or appropriate
Part of speech: pronoun
Definition: A sufficient or adequate number, amount, etc.
Part of speech: interjection
Definition: stop! Don't do that anymore, etc.
Example sentence: If everything seems under control, you're just not going fast enough.