Struggling with the Sagrada Família article — is 主塔 a common word or unusually technical?

Question

サグラダ・ファミリアの主塔「イエス・キリストの像」が完成 — I could follow most of this but 主塔 (main tower) stumped me for a while. Is this specialized architecture vocab or something I should just know by N3?

Accepted Answer

主塔 is somewhat specialized (architecture/construction vocab) — you wouldn't be expected to know it cold at N3, but 塔 (tower) itself is common and worth knowing since it shows up in place names and news constantly (東京タワー isn't 塔 but 五重塔、鉄塔 etc. are). Don't sweat missing 主塔 specifically.