Calamus and Rattan palm

Calamus noun - Any tropical Asian palm of the genus Calamus; light tough stems are a source of rattan canes.

Rattan palm and calamus are semantically related. In some cases you can replace phrase "Rattan palm" with "Calamus", this terms are similar.

Rattan palm noun - Climbing palm of Sri Lanka and southern India remarkable for the great length of the stems which are used for malacca canes.

Calamus and rattan palm are semantically related. You can use "Calamus" instead a noun phrase "Rattan palm".