Seaweed and Sea moss

Seaweed noun - Plant growing in the sea, especially marine algae.

Sea moss and seaweed are semantically related. In some cases you can replace phrase "Sea moss" with "Seaweed", this terms are similar.

Sea moss noun - Sessile aquatic animal forming mossy colonies of small polyps each having a curved or circular ridge bearing tentacles; attach to stones or seaweed and reproduce by budding.

Seaweed and sea moss are semantically related. Sometimes you can replace term "Seaweed" with "Sea moss", this terms are similar.