WordNet sense 1 (the side of an object that is opposite its front):

backside, back end

WordNet sense 2 (the fleshy part of the human body that you sit on):

behind, bottom, bum, buns, buttocks, can, derriere, fanny, hindquarters, posterior, rump, seat, stern, tail, tush, arse, fundament, keister, nates, prat, tooshie, tush, tail end, hind end

WordNet sense 3 (rise up):

lift, rise

WordNet sense 4 (bring up):

nurture, parent, raise, bring up

WordNet sense 5 (cause to rise up):

erect

WordNet sense 6 (stand up on the hind legs, of quadrupeds):

rise up

WordNet sense 7 (construct, build, or erect):

put up, set up

WordNet sense 8 (located in or toward the back or rear):

rearward

WordNet sense 9 (related to or located at the back):

back