The smaller 4 letter word could be "Tiny".
a Bump?
dent
lyre
tart
gnat
bead
teal
The 4-letter word that means a small amount of something is "mite." A mite is a very small amount or portion of something, often used to indicate a tiny quantity. It can also refer to a tiny arachnid belonging to the Acari order.
the answer is "TOE HOLD"
One option is baby.
very
Worn!! your welcome...