刚 vs 刚才

刚 is an adverb welded to the verb (刚回到家); 刚才 is a time noun — it can open the sentence on its own (刚才桌子上有一本书吗？).

刚

gāng ㄍㄤ剛

exactly; precisely; barely; only just

radical 刂 · knife

knife

stroke order · 6

刚才剛才

gāngcái ㄍㄤㄘㄞˊ

just now; a moment ago

刚才和你说话的人是谁？

Who was the person talking to you just now?

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