Broom grass and Prairie grass

Broom grass noun - Any of several grasses of the genus Andropogon; used in broom making.

Prairie grass and broom grass are semantically related. In some cases you can replace phrase "Prairie grass" with "Broom grass", this phrases are similar.

Prairie grass noun - Handsome hardy North American grass with foliage turning pale bronze in autumn.

Broom grass and prairie grass are semantically related. You can use "Broom grass" instead a noun phrase "Prairie grass".