Hydrophyte and Marsh plant

Hydrophyte 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.

Marsh plant and hydrophyte are semantically related. In some cases you can replace phrase "Marsh plant" with "Hydrophyte", this terms are similar.

Marsh plant noun - A semiaquatic plant that grows in soft wet land; most are monocots: sedge, sphagnum, grasses, cattails, etc; possibly heath.

Hydrophyte and marsh plant are semantically related. You can use "Hydrophyte" instead a noun phrase "Marsh plant".