Crocus and Iridaceous plant

Crocus noun - Any of numerous low-growing plants of the genus Crocus having slender grasslike leaves and white or yellow or purple flowers; native chiefly to the Mediterranean region but widely cultivated.

Iridaceous plant and crocus are semantically related. In some cases you can use "Iridaceous plant" instead a noun "Crocus".

Iridaceous plant noun - Any bulbous plant of the family Iridaceae.

Crocus and iridaceous plant are semantically related. Sometimes you can replace term "Crocus" with "Iridaceous plant", this terms are similar.