tighten / titan 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. 👇
tighten: (verb) make tight or tighter. (verb) become tight or tighter.
titan: (noun) (Greek mythology) any of the primordial giant gods who ruled the Earth until overthrown by Zeus; the Titans were offspring of Uranus (Heaven) and Gaea (Earth). (noun) the largest of the satellites of Saturn; has a hazy nitrogen atmosphere.
tighten: t·AY·t·ah·n
titan: t·AY·t·ah·n
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)