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"tower" is also used as a crossword clue. If that's what you saw, the answer is often column (6 letters).
Definitions
appear very large or occupy a commanding position
Word origin
From Middle English tour, tur, tor, from Old English tūr, tor, torr ("tower; rock"; > English tor) and Old French tour, toer, tor; both from Latin turris (“a tower”), Ancient Greek τύρρις (túrrhis) (Hesychius), τύρσις (túrsis). Displaced native Middle English stepel for the general sense of "tower".
Used in a sentence
“an observation tower, an isolated watch tower, a church tower, conning tower”
“The valley is closed in at the lower end by the village, the church tower and a few roofs being visible through the trees; […]”
“[…] an isolated watch-tower still stands above the highway as it passes around the lowest ridge extending from the castle. Called Burj al-Sabi ('Tower of the Youth'), it protected the access to the castle's port […]”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer6 curated clues
01“High structure”5 letters
02“High vertical structure”5 letters
03“Structure taller than wide”5 letters
04“Tall structure”5 letters
05“Very tall structure”5 letters
06“Tall narrow building”5 letters
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