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algae vs. seaweed

algae

[ al-jee ]
plural noun,
  1. any of numerous groups of chlorophyll-containing, mainly aquatic, eukaryotic organisms ranging from microscopic single-celled forms to multicellular forms 100 feet (30 meters) or more long, distinguished from plants by the absence of true roots, stems, and leaves and by a lack of nonreproductive cells in the reproductive structures: classified into the six phyla Euglenophyta, Crysophyta, Pyrrophyta, Chlorophyta, Phaeophyta, and Rhodophyta.

seaweed

[ see-weed ]
noun
  1. any plant or plants growing in the ocean.
  2. a marine alga.

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