Algae is a related term of seedling.
As nouns the difference between algae and seedling
is that algae
) while seedling
is (botany) a young plant grown from seed.
As an adjective seedling is
which is a seedling (see below).
(biology) Any of many aquatic photosynthetic organisms, whose size ranges from a single cell to giant kelps and whose form is very diverse; some are eukaryotic and some prokaryotic; includes the seaweeds.
* (term) is a non-standard plural.
(botany) A young plant grown from seed
Any young, especially
# one grown in a nursery for transplanting
# a tree smaller than a sapling.