If I have published a paper in Lecture Notes in Computer Science, Springer, then is called a book chapter or journal paper?
- It is definitely not a journal paper.
- You can call it as a book chapter. Scimago classifies LNCS as a book series. https://www.scimagojr.com/journalsearch.php?q=25674&tip=sid&clean=0
- In my opinion, it may be more prudent to call it as a conference paper (if your LNCS volume is a conference proceedings or post-proceedings).