濃度【のうど】
concentration, density, cardinality
濃厚【のうこう】
rich (flavor, color, etc.), strong (e.g. odor), heavy, thick (soup, makeup, etc.), dense, probable, (very) likely, strong (suspicion, sense, etc.), pronounced, passionate, sensuous, hot
濃縮【のうしゅく】
concentration (e.g. of a solution), enrichment, condensation
濃淡【のうたん】
light and shade, shade (of colour, color), depth (of flavor), complexity, strength and weakness (of flavor)
濃霧【のうむ】
heavy fog, dense fog, thick fog
濃い【こい】
deep (colour), dark, strong (flavour, smell, etc.), thick (consistency), dense, strong (possibility, etc.), thick (i.e. "as thick as thieves"), close, deep (love, etc.)
濃紺【のうこん】
dark blue