As verbs the difference between laid and back
is that
laid is past tense of lay while
back is to go in the reverse direction.
As adjectives the difference between laid and back
is that
laid is marked with parallel lines, as if ribbed, from wires in the mould while
back is near the rear.
As an adverb back is
to or in a previous condition or place.
As a noun back is
the rear of the body, especially the part between the neck and the end of the spine and opposite the chest and belly.