廊下 (ろうか)corridor; hallway; passageway

廊下, its kanji, and other words that share them.Open this graph

Kanji in 廊下

画廊がろうart gallery (esp. artworks for sale); picture gallery
回廊かいろうcorridor; gallery
渡り廊下わたりろうかpassage
ポーランド回廊ポーランドかいろうPolish Corridor
中廊下なかろうかcentral corridor; middle corridor
中門廊ちゅうもんろうcorridor connecting an annex to a pond-side building (in traditional palatial-style architecture)
側廊そくろうaisle (of a church)
前廊ぜんろうporch; portico
下車げしゃalighting (from a train, bus, etc.); getting off
下院かいんlower house; lower legislative chamber
低下ていかfall; decline
地下ちかbasement; cellar
引き下げひきさげreduction; cut
以下いかnot exceeding; and downward
殿下でんかyour Highness; his Highness
陛下へいかYour Majesty; His Majesty

See how 廊下 connects to the rest of Japanese.