Scarlet plume and Spurge

Scarlet plume noun - Mexican shrub often cultivated for its scarlet-bracted flowers.

Spurge and scarlet plume are semantically related. In some cases you can use "Spurge" instead a noun phrase "Scarlet plume".

Spurge noun - Any of numerous plants of the genus Euphorbia; usually having milky often poisonous juice.

Scarlet plume and spurge are semantically related. Sometimes you can replace phrase "Scarlet plume" with "Spurge", this terms are similar.