寡婦【かふ】
widow, divorced woman not remarried, unmarried woman
寡黙【かもく】
untalkative, quiet, taciturn, reticent, uncommunicative
多寡【たか】
degree (of something), greatness or smallness (of something), quantity, number, amount, size
寡占【かせん】
oligopoly
寡作【かさく】
unprolific (writer, artist, etc.)