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Assembler- A computer program that takes computer instructions and converts them into a pattern of bits that the computer can understand and perform by it certain operations.
Compiler- program that processes statements written in a programming language and turns them into machine language that a computer's processor uses. this program get the syntax error in the written program



Conceptually speaking, both an assembler and a compiler do exactly the same thing: they take as input some language that is human-understandable, and translate that directly into machine code instructions that the computer can execute.

However, in common usage, an "assembler" refers specifically to a such a program that takes as its input assembly language. Assembly language is a very "low-level" programming language, where short acronyms as used to represent machine instructions. Thus, assembly language very, very closely mirrors the actual machine code being executed, and (realistically) is only very mildly "human readable". Assemblers do little more than directly translate the assembly source code into machine code - that is, they don't do optimization of their own, as assembly language is meant as a direct representation of the machine code, and thus no optimization is required (or, desired).

A "compiler" generally refers to any other instance of this concept, but usually means something that take a "higher-level language" (i.e. anything above assembly language) and translates that to machine code. Compilers generally need to be significantly "smarter" than an assembler, as the compiler does a whole lot more work, and thus, has the opportunity to make significantly optimizations when doing the source->machine code translation. That is, high-level languages allow for the expression of concepts of ideas, which make them ideal for humans to write programs in. The compiler must be sophisticated enough to take these ideas and convert them into concrete machine code instructions. In addition, better compilers notice places where shortcuts can be taken (optimizations) given the overall structure of the input source code.

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简单的翻译就是 汇编的编译器叫汇编器(Assembler)

不过我个人很少用这个词 容易引起误会 有人提 记一下罢