based / baste 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. 👇
based: (verb) situate as a center of operations. (adjective) having a base. (adjective) having a base of operations (often used as a combining form).
baste: (noun) a loose temporary sewing stitch to hold layers of fabric together. (verb) cover with liquid before cooking. (verb) sew together loosely, with large stitches.
based: b·EY·s·t
baste: b·EY·s·t
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)