allowed / aloud 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. 👇
allowed: (verb) let have. (verb) give or assign a resource to a particular person or cause. (verb) allow or plan for a certain possibility; concede the truth or validity of something. (verb) grant as a discount or in exchange. (verb) allow the presence of or allow (an activity) without opposing or prohibiting.
aloud: (adverb) using the voice; not silently.
allowed: ah·l·AW·d
aloud: ah·l·AW·d
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)