为什么叫从属连词，并列连词

丛属是所属关系
并列是同等关系

连词是一种虚词，它不能独立担任句子成分而只起连接词与词，短语与短语以及句与句的作用。连词主要可分为两类：并列连词和从属连词。
并列连词用来连接平行的词、词组和分句。如：and, but, or, nor, so, therefore, yet, however, for, hence, as well as, both…and, not only…but also, either…or, neither…nor, (and)then等等。
从属连词用来引导名词从句和各类的状语从句。从属连词按词形分为简单从属连词，复合从属连词，关连从属连词。
1) 简单从属连词 常见的有: after, although, as, because, before, if, lest,once, since, that, till, unless, until, when, where, whether, while 等。
2) 复合从属连词
由两个或两个以上单词构成的从属连词，如:as if, as far as , as soon as, according as , in case , no matter who(how,what,when, where), rather than, for all that , given( that), in order that, now (that), on condition that 等。