The spelling of the word "portport" can be confusing at first glance. However, it is pronounced as "pɔːt-pɔːt." The first syllable "pɔːt" is spelled with the letter "o" but pronounced with the long "o" sound. The second syllable "pɔːt" is spelled similarly to the first one, but they are pronounced with a slight difference in stress. This word can be used to describe a double door entrance to a building or ship. Overall, understanding the pronunciation of "portport" can alleviate the confusion around its spelling.
I’m sorry, but it seems like the word "portport" is not recognized in any known dictionary or language. It is possible that it might be a specific term used in a particular context or domain, or it could be a typographical error or a misspelling. Without further information, it is impossible to determine the etymology or meaning of this word.