tongue / tung 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. 👇
tongue: (noun) a mobile mass of muscular tissue covered with mucous membrane and located in the oral cavity. (noun) any long thin projection that is transient. (noun) a manner of speaking. (noun) the tongue of certain animals used as meat. (noun) the flap of material under the laces of a shoe or boot. (verb) articulate by tonguing, as when playing wind instruments. (verb) lick or explore with the tongue.
tung: NA
tongue: t·AH·ng
tung: t·AH·ng
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)