Bearded iris and Iris

Bearded iris noun - Any of numerous wild or cultivated irises with hairlike structures on the falls (the drooping sepals).

Iris and bearded iris are semantically related. In some cases you can use "Iris" instead a noun phrase "Bearded iris".

Iris noun - Muscular diaphragm that controls the size of the pupil which in turn controls the amount of light that enters the eye; it forms the colored portion of the eye.

Bearded iris and iris are semantically related. Sometimes you can replace phrase "Bearded iris" with "Iris", this terms are similar.