Arigato- Thanks
Kawaii - Cute
Amai- Sweet
Shitashii- Honey
Hi- Day
Nakayoshi, Yuujyou - Friendship
Tomodachi, Nakama - Friend
Ai - Love
Ai suru- Love someone
Toku ni- Especially
Nozomi- Wish
Nozomu- Wish something
Konbanwa- Goodnight
Oyasuminasai- Goodnight
Sayoonara- Goodbye
Adohayo - Goodmorning
Konbawa - Goodafternoon
Konnichiwa - Hello/Hi
Dai Suki - I like you (in the way of "I love you")
Aishiteru - I love you
Watashi - Me (to girls)
Boku wa - Me (to boys)
Sensei - Teacher
Misu - Water
Hikari - Light
Tsuki - Moon
Yuki - Snow
Shiroi - White
Kuro - Black
Neko - Cat
Janai - negation (ex. watashi wa baka janai = I'm not stupid)
Baka - stupid/idiot
Chibi - short
Sugoi - cool
iie - no (answer)
nai - no (negative informal)
miemasen - I can't see
doo itashimashite - your welcome
sukoshi - not very much
daijoubu - don't worry
shikata ga nai - can't do something
fuben - not pratic

Nani - why?
Okairi - Welcome (welcome someone)
Tadayima - I'm back!
Daijoubu - It's everything all right? (worry)
Deshou? - Question
Bouken - Adventure
Kagerou - Ephemeral (insect)

Kagayaku - Brilliant
Hana - Flower
Tsubasa - Wings
Zetsubou - Despair
Sayonara - Bye
Kawatta - Different/Strange
Kawa - River
Hime - Princess
Megami - Godness
Kami - God
Kamikaze - Wind of God
Kagami - Mirror
Saikai - Reunion
Negai - Wish
Anata - Honey
Gozu - Someone that have style
Doushite? - Why? (other way to say nani)
Yume - Dream
Shinigami - God of Death
Ichigo - Strawberry
Momo - Peach
Hentai - Porn
Yaoi - Lovely relationships between men
Yuri - Lovely relationships between women
Shonen - Boy
Shojo - Girl
oka san - Mother
otto san - Father
nee chan - Sister
oni chan - Brother
imoto chan - Young sister
oba san - Grandmother/ Aunt
Omoide - Memory
Omoi - Thought
Okashi - Candies
Ningen - Humans
Sakura - Flowers of cherry tree
Fushigi - Marvels
Nandemonai - It was nothing!
Borei - Ghost
Nadeshiko - Carnations
Abunai - Watch out!
Bakemono - Monster
Akuma - Demon
Otome - Virgin
Onegai - Please!
Ai - Love
Hai - Yes
Gomemasai - Sorry
Domo - Much (ex. domo arigatou = thank you very much = arigatou gosaimasu)
Minna - Guys/Everyone
Sumomo - Plum
Moyashi - Shoot of a bean
Omedetou -  Celebration
Tanjoubi Omedetou - Happy Birthday
Chokoreto - Chocolate
Korosu - Kill
Monogatari - Story
Uta - Song / Music
Fuyu - Winter
Oshiete – Tell me! / Explain me / Teach me
Aoi - Blue
Kon- Blue marine
Kakera - Piece
Shiranai! – I don’t know!
Mirai - Future
Nakama - Friends
Yuutsu - Melancholy / Boring
Butou - Dance
Kotoba - Word
Sekai - World
Fuku - Uniform
Rei - Zero
Akachan - Baby
Shishou- Master
Bara - Rose
Senshi - Fighter
Futari – Together / Group of 2 people
Shinbun - Newspaper
Jikan - Hour / Time
Nemure / Nemuritai - Sleep / Sleepy
Sabishi – Alone
Higeki - Tragedy
Chou - Dragonfly
Hibi - Day
Hotaru - Firefly
Kaitou - Robber
Ureshii - Happy
Betsu ni – Not at all
Some expressions:
ohayô = Goodmorning
kon'nichiwa = Goodafternoon (at 11 o’clock it start to say this word)
konbanwa = Goodnight (when arrive)
oyasumi / oyasuminasai = Goodnight (when going to sleep)
sayônara = Bye
dewa mata / ja mata = See you later

arigatô = thank you
dômo = thanks
arigatô gozaimasu = thank you very much
dômo arigatô gozaimasu = thank you very much
dôitashimashite = your welcome

sumimasen = sorry,  please, thank you
shitsureishimasu = with permission

dôzo = please (offering)
onegai = please (asking)
kudasai = please (asking, in the end of a phrase)