Leguminous plant and Soybean plant

Leguminous plant noun - An erect or climbing bean or pea plant of the family Leguminosae.

Soybean plant and leguminous plant are semantically related. In some cases you can replace phrase "Soybean plant" with "Leguminous plant", this phrases are similar.

Soybean plant noun - Erect bushy hairy annual herb having trifoliate leaves and purple to pink flowers; extensively cultivated for food and forage and soil improvement but especially for its nutritious oil-rich seeds; native to Asia.

Leguminous plant and soybean plant are semantically related. You can use "Leguminous plant" instead a noun phrase "Soybean plant".