石炭: coal

単車: a motorcycle, motorbike / 単射: an injective function / 炭車: a minecart for carrying coal

丹砂: cinnabar / 炭車: a minecart for carrying coal

単組: abbreviation of 単位組合 (tan'i kumiai): a unit association, the smallest sub-group within a labor union / 炭疽: anthrax (the disease) / 炭素: carbon (chemical element)

嘆訴, 歎訴: to make a tearful appeal, to make a complaint while crying and wailing

丹山, 坦山, 探山, 湛山, 端山: a male given name / 湛山: a surname

短編: short stories

単品: individual item

単位系: a system of measurement

(idol fandom) being a fan of only one member of a group