甲斐[kai] effect
甲斐甲斐しい[kaigaishii] gallant
甲斐性[kaishou] resourcefulness
甲斐無し[kainashi] worthless
生甲斐[ikigai] something one lives for

年甲斐もない[toshigaimonai] unbecoming
友達甲斐[tomodachigai] true friendship
有斐閣[yuuhikaku] Yuuhikaku (law book publisher)
不甲斐ない[fugainai] disappointing
遣り甲斐[yarigai] being worth doing

インディア紙[indiakami] India paper
クラフト紙[kurafutoshi] craft paper
ケント紙[kentoshi] Kent paper
リトマス試験紙[ritomasushikenshi] litmus paper
一紙半銭[isshihansen] small sum

陰画紙[ingashi] (photographic) printing paper
印刷紙[insatsushi] printing paper
印紙[inshi] (revenue) stamp
烏紙[karasugami] coarse dark-brown paper
黄表紙[kibyoushi] illustrated storybook with yellow covers (Edo period)