看板【かんばん】
signboard, sign, billboard, hoarding, doorplate, draw, attraction, feature, highlight, spokesman, figurehead, reputation (of a shop), name, appearance, look, show, closing (for the day, esp. of a restaurant or bar), closing time
板【いた】
board, plank, sheet (of metal), plate (of glass), pane, slab, cutting board, chopping board, chef (esp. of high-end Japanese cuisine), cook, stage (i.e. at a theatre)