cobalt

hill

to employ; employment

looks back, double-takes (often as 一(いっ)顧(こ) (ikko)) / (figuratively, chiefly in the negative) care, concern; amount one cares

marlin

The katakana syllable コ (ko). Its equivalent in hiragana is こ (ko). It is the tenth syllable in the gojūon order; its position is カ行オ段 (ka-gyō o-dan, “row ka, section o”).

子: a boy, a girl, a child / 小: small, little

個:

a male given name

(Japanese lake) Lake Biwa