As far as I can tell, "machin", "truc" and "bidule" (which all mean "stuff" in french) have the same meaning as "jawn". I wonder what's so different about "jawn

As far as I can tell, "machin", "truc" and "bidule" (which all mean "stuff" in french) have the same meaning as "jawn". I wonder what's so different about "jawn", maybe it's just used more?