horseradish vs horseradish root

horseradish and horseradish root both are nouns.

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

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

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

horseradish (noun)	horseradish root (noun)
grated horseradish root	the root of the horseradish plant; it is grated or ground and used for seasoning
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