Madder and Rubiaceous plant

Madder noun - Eurasian herb having small yellow flowers and red roots formerly an important source of the dye alizarin.

Rubiaceous plant and madder are semantically related. In some cases you can use "Rubiaceous plant" instead a noun "Madder".

Rubiaceous plant noun - Any of numerous trees or shrubs or vines of the family Rubiaceae.

Madder and rubiaceous plant are semantically related. Sometimes you can replace term "Madder" with "Rubiaceous plant", this terms are similar.