The Japanese word for light is
明かり

あかり - akari

light

Japanese Definition

照らす
1. v. (ja-vp, 照らす, 照る)
2. v. to illuminate
青天井を照らせ！ - Illuminate the heavens!
3. v. to shine upon
4. v. to refer to
事実に照らして… - in light of the facts…

軽い
1. adj. light
軽い荷物 - light baggage
2. adj. slight, light, mild
軽い罰 - a light punishment
軽い肺炎 - mild pneumonia
3. adj. easy
軽い仕事 - an easy job
4. adj. talkative
彼女は口の軽い女だ。 - She is a talkative woman.

明かり
1. n. (from 1163) light
(synonyms, ja, 光, tr1=hikari)
2. n. 灯り: (from 1809) lighting, a light, a lamp, artificial illumination
(synonyms, ja, 照明, tr1=shōmei, 灯火, tr2=tomoshibi, q2=archaic, ランプ, tr3=ranpu, 電灯, tr4=dentō, pos4=specifically electric light, 電気, tr5=denki, id5=electric light, pos5=specifically electric ligh
明かりを点ける。 - Turn on the light.
3. n. (from 1603) a bright place; (metaphor) a public place
4. n. (from 1701) a positive sign amidst adversity q, compare noncog, en, light at the end of the tunnel
5. n. (from 1780) (metaphor) evidence that dispels a question or doubt
(synonyms, ja, 証し, tr1=akashi)
6. n. (from 1566) (metaphor) the end of a period of time or a dark mood q, compare noncog, en, dawn, daybreak
(synonyms, ja, 明け, tr1=ake, lit1=dawn)

灯り
1. n. alternative form of ja 明かり

光源
1. n. light source (source of illumination)

光
1. n. (a physically perceived light:)
2. n. a light, beam, illumination
3. n. a gleam, glow, ray
4. n. a glimmer, shine, sparkle
ダイヤモンドの光 - a diamond's glitter / shine / twinkling
5. n. a luster/lustre, polish, sheen
6. n. (a metaphorical light:)
7. n. glory, influence, power
8. n. a glimmer, gleam
前途に光を失う - to lose light regarding the future → future prospects grow dim
解決への道に光を投げかける - to shed light on the way to a solution
9. n. positive aspect
インターネット時代の光 - the positive aspect of the internet age
10. n. a displaying, putting on airs
11. n. a vision, eyesight
12. n. (optics) (relating to light or vision:) optical, photo-
光ファイバー - optical fiber
13. affix. light, gleam, shine
14. affix. gleaming, shining
15. affix. scenery
16. affix. glory, honor/honour, pride
17. affix. enlightening
18. affix. exhaust, run out

明るい
1. adj. bright, light, luminous
明るい日差しがあたりを照らしていた。 - The bright sunshine illuminated the area.
2. adj. merry, cheerful
電話の向こうから明るい声が返ってきた。 - A cheerful voice answered the phone.

光明
1. n. light
2. n. hope in adverse circumstances

視点
1. n. point of view (a visual point)
映像にプレイヤーの視点を重ねて表示する - display different players' points of view at once on the screen
2. n. point of view (an opinion)
アメリカ人の視点で撮影したドキュメント映像 - a documentary shot from an American's point of view

観点
1. n. a viewpoint; a point of view
あらゆる観点からの描写を平等に扱い - treating portrayals from every point of view impartially

火
1. n. a fire:
2. n. a flame
3. n. : (synonyms, ja, 火気, tr=kaki, ファイア, tr2=faia, 炎, tr3=honō)
4. n. cooking fire
5. n. a firestarter
6. n. sparks
7. n. light (matches or lighter)
8. n. : (ja-x, 火を貸してもらえる？, ひをかしてもらえる？, Can I borrow a light?)
9. n. heat
10. n. : (synonyms, ja, 火熱, tr=kanetsu, 熱, tr2=netsu)
11. n. a conflagration
12. n. : (synonyms, ja, 火災, tr=kasai, 火事, tr2=kaji)
13. n. a signal fire
14. n. : (synonyms, ja, 狼煙, tr=noroshi)
15. n. (by extension) a light
16. n. a burning passion
17. n. menstruation
(synonyms, ja, 月経, tr=gekkei)
18. n. a fire
19. n. one of the five classical elements in traditional Chinese philosophy and medicine: see (pedia, Wu Xing)
20. n. (historical) under the old 律令 system of ancient Japan, a military grouping, consisting of 10 soldiers: a squad
(synonyms, ja, 分隊, tr=buntai)
21. affix. fire
22. affix. light
23. affix. burning
24. affix. passion
25. affix. imminently
26. affix. explosive