計 KEI, haka(ru), haka(rau) - plan, total, measure
俳 HAI - actor
江 KOU, e - inlet, bay
軒 KEN, noki - counter for buildings, eaves
氷 HYOU, kouri, hi, kou(ru) - ice, freeze
Add a single stroke to each of these to make another character.
討 TOU, u(tsu) - attack
排 HAI - exclude, eject, repel
汗 KAN, ase - sweat
幹 KAN, miki - main part, trunk
泳 EI, oyo(gu) - swim