tacks / tax are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
tacks: (noun) the heading or position of a vessel relative to the trim of its sails. (noun) a short nail with a sharp point and a large head. (noun) (nautical) the act of changing tack. (noun) sailing a zigzag course. (verb) fasten with tacks. (verb) turn into the wind.
tax: (noun) charge against a citizen's person or property or activity for the support of government. (verb) levy a tax on. (verb) set or determine the amount of (a payment such as a fine). (verb) use to the limit. (verb) make a charge against or accuse.
tacks: t·AE·k·s
tax: t·AE·k·s
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)