Sufficient means enough.
Example
I don't have sufficient money to buy a new car.
This example sentence uses the word 'sentence' in an exemplary fashion.
This is a quiet zone.
She advised him to exercise prudence with his finances, urging him to save rather than spend impulsively.
There are cautions that she uses when she crosses the streets.
I gave a quick answer, then left.
The second sentence the word is used correctly, but it is weak. The first sentence, the word is not used correctly. I think that the sentence, "Are these snacks really sufficient for your trip?," is more proper.
Animals and insects are part of the ecosystem. This is an example of a sentence that uses the word "ecosystem."
There is no oligarchy in the modern world. This is the sentence that uses the word oligarchy.
I shot a taco with meat.
Here is an example of a sentence that uses the word gadget in a sentence: The gadget the inventor had created began to spin around on the table and knock over the cups that had been set out.
You have very sufficient work, Kayla!
Someone uses the word 'term' in a sentence as a synonym for word. For example, Shogun is a term for a military commander of Japan.