It's not really safer. And some systems choke on non-alphanumeric symbols in a password - I suspect one of our systems can't take a !
A password of 8 genuinely random letters is safe. I standardise on Abcdef78 - as format, not as actual password - as concession to stupid system rules (and with all consonants, like I think I said above), and I put ! at the end if I really have to. But a password of a word with $ for S isn't safe because hackers have already got all those combinations in their dictionary.