Across: 1.girl, 3.snub, 6.moby, 9.stay, 11.amp, 12.zinc, 13.afar, 14.her, 15.seat, 17.kite, 20.wade, 21.skid

Down: 1.gum, 2.rub, 4.net, 5.boy, 7.olive, 8.yacht, 9.spark, 10.apart, 15.sew, 16.aid, 18.ink, 19.end