Cantonese has 6 tones. Same syllable, different tone, different meaning.

• 詩si1tone 1 — high level — poem
• 史si2tone 2 — high rising — history
• 試si3tone 3 — mid level — to try
• 時si4tone 4 — low falling — time
• 市si5tone 5 — low rising — market
• 事si6tone 6 — low level — matter / affair
• si1 si2 si3 si4 si5 si6詩 史 試 時 市 事one sound, six tones, six meanings