Compounds of

• クス
  (n) (uk) camphor tree (Cinnamomum camphora)
  camphorwood
  camphor laurel
• クビ
  (n) (1) neck
  (2) head
  (3) unemployed person
• クリ
  (n) (abbr) (vulg) clitoris
• クリ
  (n) (uk) Japanese chestnut (Castanea crenata)
• グー
  (adj-na) (1) good
  (n) (2) goo
  (n) (3) rock (in rock-paper-scissors game)
  (n) (4) (col) fist
  (P)
• グイ
  (adv-to) (on-mim) with a jerk
• グミ
  (n) (uk) oleaster (any plant of genus Elaeagnus)
  silverberry (US)
• グロ
  (adj-na,n) (abbr) grotesque
  (P)
• ケア
  (n,vs) (1) care
  (n) (2) kea (Nestor notabilis)
  (P)
• ケリ
  (n) (uk) gray-headed lapwing (Microsarcops cinereus)
  grey-headed lapwing
• ケ月
  (ctr) (number of) months
  (P)
• ケ国
  (ctr) counter for countries
• ケ所
  (n) passage
  place
  point
  part
• ゲイ
  (n) gay
  (P)
• ゲッ
  (int) exclamation of surprised disappointment, disgust, or worry (yuck, ick, ack, eeew, crap!, blech, gross)
• ゲバ
  (n) (abbr) (political) violence
  violent tactics used by political radicals
• ゲラ
  (n) (1) (abbr) galley (tray used for printing)
  (2) galley proof
• ゲル
  (n) (1) gel (ger: Gel)
  (2) money (ger: Geld)
  (3) yurt (mon: gher)
  (P)
• ゲン
  (n) gene (ger: Gen)
  (P)
• コア
  (n) core
  (P)
• コイ
  (n) Khoi (people)
  Khoikhoi
  Khoi-khoin
• コシ
  (n) (1) back
  lower back
  waist
  hips
  lumbar region
  (2) body (of hair, noodle, paper, etc.)
  resilience
  spring
• コチ
  (n) (uk) flathead (esp. the bartailed flathead, Platycephalus indicus)
• コツ
  (n) (uk) knack
  skill
  trick
  secret
  know-how
  the ropes
  hang
• コナ
  (n) Kona (variety of Hawaiian coffee)
• コネ
  (n) (abbr) connection
  pull
  (P)
• コマ
  (n) (1) coma
  (2) frame in a film or video
  (P)
• コム
  (n) (comp) computer output microfilm system
  COM
  (P)
• コメ
  (n,vs) (1) (abbr) comment
  (2) (blog) comment
• コル
  (n) col (fre:)
  (P)