billed / build 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. 👇
billed: (verb) advertise especially by posters or placards. (adjective) having a beak or bill as specified.
build: (verb) build or establish something abstract. (verb) improve the cleansing action of. (verb) order, supervise, or finance the construction of. (verb) give form to, according to a plan. (verb) be engaged in building. (verb) found or ground. (verb) develop and grow.
billed: b·IH·l·d
build: b·IH·l·d
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)