Which word indicates a small amount or number?

The word "paucity" is the most fitting choice as it specifically refers to a small amount or number of something, often used in contexts where scarcity or lack is highlighted. It conveys the idea of a limited quantity, which can apply to resources, numbers, or other measurable attributes.

In contrast, "abundance" refers to a large quantity or plentiful amount of something, presenting the opposite of scarcity. "Surfeit" denotes an excessive amount, often leading to negative consequences, while "excess" also implies a surplus beyond what is necessary or required. Therefore, "paucity" accurately captures the essence of a small or insufficient amount, making it the correct choice.