word 普通用词，指语言的最小单位的单词、字，也可指话、整句话或一段话。
vocabulary 集合名词，指词汇、语汇或词汇量。
language 普通用词，指国家、民族或种族内部使用，已经系统化的语言。
term 指有特定意义的词，词语或术语。
lexicon 指某种语言、某人或某一知识领域的全部词汇。
参考例句
1. THE term "food miles" - how far food has traveled before you buy it - has entered the enlightened lexicon. “食物里程”这个词汇已被编入词典，意思是食物在你购买前行驶过的距离。
2. As a language can reflect a given culture, lexicon in a language will inevitably have cultural connotation. 语言反映民族的文化，一种语言中的词汇就必不可少地带有文化内涵。
3. It is no accident that Modern English shares much of its lexicon with French, though its base grammar is Germanic. 现在英语与法语字典共享了很多单词并不是偶然的，但是英语的基础语法却是日耳曼语言。
英英解释
n.
1. a language user's knowledge of words
2. a reference book containing an alphabetical list of words with information about them
