Normally written as ヶ when used as a counter for months

個: articles

(obsolete) silkworm

(rare) hakama: a type of traditional Japanese trousers / (rare) momohiki: traditional Japanese closefitting workman's trousers

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”).