A tower, steeple, or spire — a tall architectural structure often used for observation, bells, or as a monument.
東京タワーは有名な観光名所の塔だ。
Tokyo Tower is a famous sightseeing tower.
教会の塔から街が一望できる。
You can get an overview of the town from the church tower.
古い城の塔は修復が必要だ。
The old castle tower needs restoration.
An older/original meaning referring to a stupa or pagoda (Buddhist reliquary tower); sometimes used as an abbreviation for such structures.
境内には古い仏塔（塔）が残っている。
An old stupa (tower) remains on the temple grounds.
僧侶たちは塔の前で供養を行った。
The monks held a memorial service in front of the pagoda.