the liver / innards / (figuratively) important part

pleased / delighted / happy

coccyx: more commonly 尾骨 (bikotsu) / butt, backside, posterior: しり (shiri), more commonly spelled 尻

ride horseback / mount / cavalry

pigeon, dove / (by extension) gather together (from the way that pigeons flock together)

crested ibis

remains, ashes / knack, trick

a record of events and facts / a record of daily events or thoughts; a diary or journal

(Buddhism) the evil from the mouth, the use of malicious gossip

a solid