Vascular plant and Water plant

Vascular plant noun - Green plant having a vascular system: ferns, gymnosperms, angiosperms.

Water plant and vascular plant are semantically related. In some cases you can replace phrase "Water plant" with "Vascular plant", this phrases are similar.

Water plant noun - A plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth.

Vascular plant and water plant are semantically related. You can use "Vascular plant" instead a noun phrase "Water plant".