These words are the same. Both of them refer to the collection of suitcases/bags you take with you while traveling.
Both of them are uncountable nouns, so don't use "a" or make them plural:
I have three luggages.
I have three pieces of luggage.
I accidentally left a baggage at the hotel.
I accidentally left a suitcase/bag at the hotel.
I accidentally left a piece of luggage/baggage at the hotel.
The place in the airport where you pick up your bags after arriving at your destination is called the baggage claim. But when the airline loses your bag, we usually say they lost your luggage (not baggage).
The word baggage has an additional meaning: emotional or psychological effects from the past that negatively affect your present situation. For example, if you had a past romantic relationship with someone who lied frequently and now you have problems trusting anybody, you have "baggage" from that relationship.
Citric acid are considered helpful in avoiding development and growth of kidney stone. It offers protective benefits by excreting out excess calcium and uric acid from the body. Acidic flavor of Tamarillos is due to presence of citric acid present. Adding tree tomato in diet reduces risk of kidney stones. However, no direct scientific evidence is available on benefits of tamarillos over kidney stones.