is a specific kind of: aquatic plant, hydrophyte, hydrophytic plant, water plant.

is a broader term that covers: curled leaf pondweed, curly pondweed, Potamogeton crispus | Potamogeton gramineous, variously-leaved pondweed | loddon pondweed, Potamogeton americanus, Potamogeton nodosus | frog's lettuce | horned pondweed, Zannichellia palustris.

is a member of: family Potamogetonaceae, pondweed family, Potamogetonaceae.

is a specific kind of: liliopsid genus, monocot genus.

has as a member: waterweed.

is a member of: family Hydrocharidaceae, family Hydrocharitaceae, frog's-bit family, frogbit family, Hydrocharidaceae, Hydrocharitaceae.