If
If is used to show condition.
Let me know if you need anything.

Yet
Yet shows contrast or joins the opposite.
Though the wound was healed, yet the scar remains.

After
After tells us about order sequence
I can pass the gate after you show your identity card.

Whereas
Used to show the contrast
She is funny whereas he is boring.

Besides
In addition to/ also.
She speaks 5 languages besides English.

Unlike
Different from/ not similar to
You are completely unlike your father.