morning / mourning 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. 👇
morning: (noun) the time period between dawn and noon.
mourning: (noun) state of sorrow over the death or departure of a loved one.
morning: m·AO·r·n·ih·ng
mourning: m·AO·r·n·ih·ng
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)