madder vs madderwort

madder and madderwort both are nouns.

Word	Noun	Adjective	Verb	Adverb
madder	Yes	No	Yes	No
madderwort	Yes	No	No	No

As nouns, madderwort is a hypernym of madder; that is, madderwort is a word with a broader meaning than madder:

madder: Eurasian herb having small yellow flowers and red roots formerly an important source of the dye alizarin
madderwort: any of numerous trees or shrubs or vines of the family Rubiaceae

Other hypernyms of madder include rubiaceous plant.

madder (noun)	madderwort (noun)
Eurasian herb having small yellow flowers and red roots formerly an important source of the dye alizarin	any of numerous trees or shrubs or vines of the family Rubiaceae

madder (verb)	madderwort (verb)
color a moderate to strong red