适合 vs 合适

适合 is the verb — it takes an object (中号更适合您); 合适 is the adjective "suitable" — no object allowed (对我正合适).

适合適合

shìhé ㄕˋ ㄏㄜˊ

to fit; to suit

我认为中号会更适合您。

I believe the medium size will fit you better.

合适合適

héshì ㄏㄜˊ ㄕˋ

suitable; fitting; appropriate

他们在不合适的时间来了。

They came at an inconvenient time.

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