Answer:
ヨ Katakana "Yo"
十+口 JUU, tou, to - ten / KOU, kuchi - mouth
口+十+貝 KOU, kuchi - mouth / JUU, tou, to - ten / KAI - shellfish
口+ノ+丁 KOU, kuchi - mouth / Katakana "No" / CHOU, TEI - counter, block
⼇+T+フ The "Nabefuta" radical - lid, top / Alphabet "T" / Katakana "Fu"
Add 小 (SHOU, chii(sai), ko - small) for a big change!
当 TOU, a(teru), a(taru) - hit, correct
束 SOKU, taba - bundle, sheaf
慣 KAN, na(reru), na(rasu) - get used to, tame
呼 KO, yo(bu) - call, send for, invite, name
朽 KYUU, ku(chiru) - rot, decay