well, in my country (spain) assembler and assembly are basically used interchangeably, so i do that a lot. will take into account for future posts tho.

Anywhere I’ve actually seen it used , assembler and assembly were pretty much interchangeable. Assembly code is probably technically correct, but you could be writing code for the assembler so nobody will actually be confused. Per your example, you might say “I wrote code in MASM,” to reference a specific assembler. Again nobody that’s actually worked with any of this would bat an eye at the usage.