Greenhood and Orchidaceous plant

Greenhood noun - Any of numerous orchids of the genus Pterostylis having leaves in a basal rosette and green flowers often striped purple or brown or red with the dorsal sepal incurved to form a hood.

Orchidaceous plant and greenhood are semantically related. In some cases you can use "Orchidaceous plant" instead a noun "Greenhood".

Orchidaceous plant noun - Any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors.

Greenhood and orchidaceous plant are semantically related. Sometimes you can replace term "Greenhood" with "Orchidaceous plant", this terms are similar.