Learn French: Ce que j'aime dans ce dialecte, c'est le son amusant des mots. - What I like in this dialect is the amusing sound of the words.

When a French sentence starts with a subject clause like ce que (what), you usually must repeat the subject with ce (as c'est or ce sont) before introducing the noun complement. Saying Ce que j'aime... est le son sounds unnatural in French.

Why use ce que here instead of ce qui?

You use ce que when it is the direct object of the clause, and ce qui when it is the subject. Here, the verb aime already has a subject (j'), so you need the object pronoun ce que to mean 'the thing that' you like.

Could I just say J'aime le son amusant des mots dans ce dialecte?

Yes, absolutely! The Ce que... c'est... framework is a highlighting structure (called la mise en relief). It is used for emphasis, exactly like saying 'What I like... is...' in English instead of 'I like...'.

Why is the adjective amusant placed after son rather than before it?

Unlike English, most French adjectives are placed after the noun they modify. Only a specific group of common adjectives (like those for beauty, age, goodness, and size) typically go before the noun. Amusant doesn't fall into that group, so it logically follows the noun.