move back vs retrograde

move back is not an adjective while retrograde is an adjective.

Word	Noun	Adjective	Verb	Adverb
move back	No	No	Yes	No
retrograde	No	Yes	Yes	No

As verbs, retrograde is a hyponym of move back; that is, retrograde is a word with a more specific, narrower meaning than move back:

Other hyponyms of move back include fall back, retreat, back down, back off, back up.

move back (adjective)	retrograde (adjective)
	of amnesia; affecting time immediately preceding trauma
	moving from east to west on the celestial sphere; or--for planets--around the sun in a direction opposite to that of the Earth
	going from better to worse
	moving or directed or tending in a backward direction or contrary to a previous direction

move back (verb)	retrograde (verb)
pull back or move away or backward	get worse or fall back to a previous condition
	go back over
	move back
	move in a direction contrary to the usual one
	move backward in an orbit, of celestial bodies