Word: senpai
Part of speech: Noun
Syllables: sen
pai
Definition: An upperclassman or elder student.
Morphemes:
Affix: senpai
Language: en
PoS: Noun
Meaning: An upperclassman or elder student.
Etymology Compounds: Affix: 先
Language: ltc
Decoded: Xian 
Meaning: first, former
Affix: 輩
Language: ltc
Decoded: Bei 
Meaning: generation