I believe only the Gryffindor House has a password, but maybe not. In book 7 when Harry was going with Luna into the Ravenclaw House it was not a password, but a question. If you answer it correctly you will enter if not you won't.
As a student at Hogwarts, Arthur was in Gryffindor.
Each Hogwarts house has its own colours; Gryffindor's are red and gold, Ravenclaw blue and bronze, Hufflepuff yellow and black, Slytherin green and silver. Hogwarts itself is often represented by purple.
I don't really know what you mean but if you mean the Hogwarts Houses then I can help you. When you're in your first year at Hogwarts, you get sorted into a house by putting on the Sorting Hat. The Sorting Hat looks at your personality and traits and places you in house based on those traits. I hope that helped you.
Nyphodora Tonks was in Hufflepuff at Hogwarts School of Witchcraft and Wizardry
Griffindore: Rubies Slyterin: Emeralds Ravenclaw:Saphire Hufflepuff: Quartz
Gryffindor. Sirius Black (Padfoot) was the only member of the Black family to be placed in a house that wasn't Slytherin.
She was in Gryffindor House at Hogwarts.
Professor Quirrell was a member of Ravenclaw house during his time as a student at Hogwarts School of Witchcraft and Wizardry.
Remus Lupin was a member of Gryffindor house during his time at Hogwarts School of Witchcraft and Wizardry in the Harry Potter series.
It is never stated,it is unknown whether she even attended Hogwarts.
Cho Chang is in the house Ravenclaw in Hogwarts
The house of Helga Hufflepuff at Hogwarts,the house stands for kindness.
The password for the fat lady. However, it was changed often, especially after the fat lady got attacked by Sirius Black.
The girls (and boys) dormitories are all located inside the common room of each house.
That is unknown. She may not even have attended Hogwarts.
Rubeus Hagrid was in Gryffindor at Hogwarts School of Witchcraft and Wizardry. Hagrid was in the Gryffindor house.
Slytherin.