tighter / titer 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. 👇
tighter: (adjective) closely constrained or constricted or constricting. (adjective) set so close together as to be invulnerable to penetration. (adjective) affected by scarcity and expensive to borrow. (adjective) of such close construction as to be impermeable. (adjective) securely or solidly fixed in place; rigid. (adjective) packed closely together.
titer: (noun) the concentration of a solution as determined by titration.
tighter: t·AY·t·er
titer: NA
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)