Superoxide rhymes with:
peroxide, peroxide, dioxide, dockside, oxide, peroxide, backside, brookside, dioxide, dockside, exide, lakeside, oxide, parkside, peroxide
Superoxide sounds like:
seabright, seafirst, severest, shipwright, siebrecht, sobriquet, sparked, sprigged, sprocket, spruced, suffragette, suffragist, supercut, supersede, superseded, suppressed