Definition and Meaning for 譚 (phone based)

tan

坍¯探¯貪¯澹ˊ蕁ˊ曇ˊ黮ˇ忐ˇ探ˋ歎ˋ嘆ˋ

單:嘽¯彈ˊ癉ˊ

旦:坦ˇ袒ˇ

炭:炭ˋ碳ˋ

覃:覃ˊ潭ˊ譚ˊ罈ˊ驔ˊ鐔ˊ撢ˋ

亶:壇ˊ檀ˊ

難:攤¯灘¯癱¯

炎:郯ˊ談ˊ錟ˊ惔ˊ餤ˊ痰ˊ毯ˇ舕ˋ

Above chars grouped by common phonetic elements.