Answer:
シ Katakana "Shi" or The "Sanzui" radical - water
泉 SEN, izumi - spring, fountainhead, fountain
食 SHOKU, JIKI, tabe(ru), ku(u) - eat, food
糸 SHI, ito - thread
門 MON, kado - gate
羊 YOU, hitsuji - sheep
オ Katakana "O"
竹 CHIKU, take - bamboo
弟 DAI, TEI, otouto - younger brother
可 KA - good, possible, approval
Pair them like this: シ+可 糸+泉 門+オ 羊+食 竹+弟
河 KA, kawa - river
線 SEN - line
閉 HEI, shi(meru), to(jiru) - close
養 YOU, yashina(u) - rear, support, adopt
第 DAI - degree, ordinal