WordNet sense 1 (a pause for relaxation):

respite, rest, rest period

WordNet sense 2 (the condition of being comfortable or relieved (especially after being relieved of distress)):

ease

WordNet sense 3 (someone who takes the place of another (as when things get dangerous or difficult)):

backup, fill-in, reliever, stand-in, substitute, backup man

WordNet sense 4 (the feeling that comes when something burdensome is removed or reduced):

alleviation, assuagement

WordNet sense 5 (a change for the better):

moderation, easing

WordNet sense 6 (sculpture consisting of shapes carved on a surface so as to stand out from the surrounding background):

embossment, relievo, rilievo, sculptural relief

WordNet sense 7 (assistance in time of difficulty):

ministration, succor, succour

WordNet sense 8 (the act of reducing something unpleasant (as pain or annoyance)):

easement