Can some prokaryotic cells be larger than eukaryotic cells?
Prasinophytes are the smallest known eukaryotes. They are around 0.5 µm in diameter.

Thiomargarita namibiensis is the largest known prokaryote. They are around 100-300 µm in diameter.

So, yes some prokaryotes are much larger (up to about 500 times larger) than some eukaryotes.