[Pronunciation exercise] • bus – boss • color – collar • cub – cob • duck – dock • dull – doll • fund – fond • hunk – honk • hut – hot • luck – lock • nut – not • rub – rob • shut – shot • stuck - stock 

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 https://www.ecenglish.com/learnenglish/lessons/uncountable-and-countable-nouns