The wikipedia entry seems to differentiate between giunca and giunco, but still uses the term JUNK for both.
https://en.wikipedia.org/wiki/Junk_(ship)The term junk may be used to cover many kinds of boat—ocean-going, cargo-carrying, pleasure boats, live-aboards. They vary greatly in size and there are significant regional variations in the type of rig, however they all employ fully battened sails.[3] The term junk (Portuguese junco; Dutch jonk; and Spanish junco) was also used by European explorers for large unrelated native Austronesian warships, like the Philippine karakoa and the Maluku kora kora.[4]