As nouns the difference between sprout and seedling
is that sprout
is a new growth on a plant, whether from seed or other parts while seedling
is (botany) a young plant grown from seed.
As a verb sprout
As an adjective seedling is
which is a seedling (see below).
Other Comparisons: What's the difference?
A new growth on a plant, whether from seed or other parts.
A Brussels sprout.
An edible germinated seed.
(botany) A young plant grown from seed
Any young, especially
# one grown in a nursery for transplanting
# a tree smaller than a sapling.