whiplash injury vs whiplash

whiplash injury and whiplash both are nouns.

Word	Noun	Adjective	Verb	Adverb
whiplash injury	Yes	No	No	No
whiplash	Yes	No	No	No

As nouns, whiplash injury and whiplash are synonyms defined as:

whiplash injury and whiplash: an injury to the neck (the cervical vertebrae) resulting from rapid acceleration or deceleration (as in an automobile accident)

whiplash injury (noun)	whiplash (noun)
an injury to the neck (the cervical vertebrae) resulting from rapid acceleration or deceleration (as in an automobile accident)	a quick blow delivered with a whip or whiplike object
	an injury to the neck (the cervical vertebrae) resulting from rapid acceleration or deceleration (as in an automobile accident)