Tiny, miniscule, minute, microscopic.
Nanosize means very small. It is something that is on a very small scale and is measured in nanometers.
No room to swing a cat referers to a very small area.
A crumb, a very small amount.
Moderate. The others mean small but moderate means medium.
The word little is an adjective. It describes something that is small in size (little girl little box).An adjective as in 'small in size'. A pronoun as in 'a small amount of'. An adverb as in 'a small extent'.
The prefix "micro-" means small or tiny. It is commonly used in words to indicate something of a very small size or scale.
TinyMiniLittleTeenyMidget
very small
A very very small unit
pettite small
Small
Nanosize means very small. It is something that is on a very small scale and is measured in nanometers.
0.0000000000000000000000000000000000001 is a very small decimal number. ^^
A grotto.
tiny
No room to swing a cat referers to a very small area.
Some words that mean a small cave are grotto, cavern, and den.