horseradish root vs horseradish

horseradish root and horseradish both are nouns.

Word	Noun	Adjective	Verb	Adverb
horseradish root	Yes	No	No	No
horseradish	Yes	No	No	No

As nouns, horseradish root and horseradish are synonyms defined as:

horseradish root and horseradish: the root of the horseradish plant; it is grated or ground and used for seasoning

horseradish root (noun)	horseradish (noun)
the root of the horseradish plant; it is grated or ground and used for seasoning	grated horseradish root
	coarse Eurasian plant cultivated for its thick white pungent root
	the root of the horseradish plant; it is grated or ground and used for seasoning