2571. What character can be added to both of these characters to give other characters? 丘_ -> _甲

丘  FUKU, fu(su), fu(seru) - bend down, lie down, turn over, conceal

甲  KOU, KAN - first in a series, high voice

Add 山:丘+山 山+甲  

山  SAN, yama - mountain

岳  GAKU, take - mountain peak

岬  misaki - headland, point