noun
word book; vocabulary list; glossary
A collection of words, often for study or reference; can be a physical book or a digital list.
試験のために単語集を買った。
I bought a word book for the exam.
この単語集にはよく使う表現が載っている。
This vocabulary list contains commonly used expressions.
用語集 is a glossary of technical terms, whereas 単語集 is a broader word list.
Compound of 単語 (tango, 'word') and 集 (shū, 'collection').