Snafu, snag, snake, snarl, snare, snatch, sneak, sneer, snide, snigger, snip, snivel, snob, snoop, snooty, snub and snuff.
The composition possibilities are endless: “The man sneered and sniggered as he snatched the snarling snake from the snag.”
A few “sn” words are neutral e.g. “snack, sniff, snout, snow,” and there is one that is downright lovable—“snuggle”. It just about makes up for all its negative and violent cousins.
Words starting in “sm” don’t fare a whole lot better. We have: “smack, smarmy, smash, smear, smelly, smog, smoke, smother, smudge, smug, smuggle and smutty.”
The “sm: words are better balanced with some positive representatives such as “smart, smile” and “smitten” and a few neutral ones such as “small” and “smooth.”
In general, however, if you wish to express something in English which has a negative (or even violent) tone, look first to your “sn” words, secondly your “sm” words. In fact, all consonant blends starting with “s” may be fundamentally suspect. “Don’t forget words like “slimy, slither, scoff, sting, stench, strangle, spit, squash, squirm, stagger, scar, scamp, scandal, scare, scowl, scrap, scruffy and scum.”
Isn’t the English language just “scrumptious”?