tower (n.1)

Old English torr "tower, watchtower," from Latin turris "a tower, citadel, high structure" (also source of Old French tor, 11c., Modern French tour; Spanish, Italian torre "tower"), possibly from a pre-Indo-European Mediterranean language. Meaning "lofty pile or mass" is recorded from mid-14c. Also borrowed separately 13c. as tour, from Old French tur; the modern spelling (1520s) represents a merger of the two forms.

tower (v.)

c. 1400, "rise high" (implied in towered); see tower (n.). Also, of hawks, "to fly high so as to swoop down on prey" (1590s). Related: Towering.

tower (n.2)

"one who tows," 1610s, agent noun from tow (v.).

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Definitions of tower from WordNet
tower (n.)
a structure taller than its diameter; can stand alone or be attached to a larger building;
tower (n.)
anything that approximates the shape of a column or tower;
a tower of dust rose above the horizon
Synonyms: column / pillar
tower (n.)
a powerful small boat designed to pull or push larger ships;
Synonyms: tugboat / tug / towboat
tower (v.)
appear very large or occupy a commanding position;
Synonyms: loom / predominate / hulk