staircase

/ˈstɛɹˌkeɪs/noun

A set of stairs inside a building, together with its railing and supports.

Example sentence

“A grand marble staircase curved up from the lobby.”

Refers to the whole structure. For the steps themselves, 'the stairs' is the everyday choice: 'up the stairs', not 'up the staircase'.

Related words

basementThe level of a building that sits below the ground.neighborA person who lives next door to you or nearby (the US spelling of neighbour).atticThe room or space just under the roof of a building, often unfinished and used for storage.mortgageA loan for buying a house or land, where the property itself serves as security until the debt is repaid.balconyA platform attached to the outside of a building, usually reached through an upper-floor door or window.rentMoney paid regularly to a landlord for the use of a home, office, or other property.