relative speed vs relative velocity

relative speed and relative velocity both are nouns.

Word	Noun	Adjective	Verb	Adverb
relative speed	Yes	No	No	No
relative velocity	Yes	No	No	No

As nouns, relative speed and relative velocity are synonyms defined as:

relative speed and relative velocity: the vector difference between the velocities of two bodies : the velocity of a body with respect to another regarded as being at rest.

relative speed (noun)	relative velocity (noun)
the vector difference between the velocities of two bodies : the velocity of a body with respect to another regarded as being at rest.	the vector difference between the velocities of two bodies : the velocity of a body with respect to another regarded as being at rest.