a crank (a bent piece of an axle or shaft, or an arm attached to the end of a shaft or wheel, used to impart a rotation)

cubism

see amanojaku above

disappointment; failure to meet expectations; let-down

(computing) kibibyte

(usually prefixed with ご) in a good mood

Kigo, a word associated with a particular season in traditional Japanese poetry.

(Japanese folklore) Shapeshifting monster, 妖怪 (yōkai), which for a ruse takes the form of either a helpless baby or tiny old man, crying near woodland trails and crushes passersby who stop to help as it transforms to devour them.

(set theory) intersection

mnemonics, the art or practice of improving one’s memory