Algae and Dross

Algae noun - Primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves.

Dross and algae are semantically related. In some cases you can use "Dross" instead a noun "Algae".

Dross noun - Discarded or useless material.

Algae and dross are semantically related. Sometimes you can use "Algae" instead a noun "Dross".