| tunnage | (noun) a tax imposed on ships that enter the US; based on the tonnage of the ship | Synonyms: tonnage, tonnage duty |
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| tunnel | (noun) a passageway through or under something, usually underground (especially one for trains or cars) | - |
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| (noun) a hole made by an animal, usually for shelter | Synonyms: burrow |
| tunny | (noun) any very large marine food and game fish of the genus Thunnus; related to mackerel; chiefly of warm waters | Synonyms: tuna |
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| (noun) important warm-water fatty fish of the genus Thunnus of the family Scombridae; usually served as steaks | Synonyms: tuna, tuna fish |