I understand you're looking for a free PDF guide for JLPT N4 vocabulary with Bangla (Bengali) explanations. This is a common need for Bengali-speaking Japanese learners.
If you are looking for a complete downloadable PDF, these platforms often host community-made Bengali-Japanese vocabulary lists: Japanese Language Learners of Bangladesh (JLLB): n4 vocabulary bangla pdf free
Use a reliable Japanese-to-Bangla dictionary – The best free option is the "Bangla Japanese Dictionary" by Jabra Islam (available on Google Play Books and some educational sites). Another is "Jisho.org" (English to Japanese) combined with your own Bangla translation skills. I understand you're looking for a free PDF
Instead of hunting endlessly, spend 2 hours making your own. Here’s how: Download a JLPT N4 Vocabulary app from the Play Store
No single, clean, comprehensive, error-free PDF exists for free as of 2025.