dorsal root vs dorsal horn

dorsal root and dorsal horn both are nouns.

Word	Noun	Adjective	Verb	Adverb
dorsal root	Yes	No	No	No
dorsal horn	Yes	No	No	No

As nouns, dorsal root and dorsal horn are synonyms defined as:

dorsal root and dorsal horn: one of two roots of a spinal nerve that passes dorsally from the spinal cord and that consists of sensory fibers

Other synonyms of dorsal root include posterior horn, posterior root.

dorsal root (noun)	dorsal horn (noun)
one of two roots of a spinal nerve that passes dorsally from the spinal cord and that consists of sensory fibers	one of two roots of a spinal nerve that passes dorsally from the spinal cord and that consists of sensory fibers