I chose "pork" as Severus' favorite word because he was a hungry kid, and pork in all its forms is glorious—just like "More...more...MORE!!!" of everything would be. Severus' intelligence, wit, and perhaps, a need to cover any insecurities he might have makes "Obviously" an excellent choice of favorite word (it was chosen twice!), as well. Impatience and anger, Severus knows these emotions well, which make "dunderhead" and "fuck" both great choices.
I selected "Potter" as Severus' least favorite word. ("James or Harry, Severus?" *snorts* "Both, of course.") Other options were "snookums," which no one could be blamed for hating; "Byronic," which might hit too close to or too far from home, depending upon his mood/characterization; "Gryffindor," which would be a fighting word; "cuddle," which implies, well, cuddling, which implies an intimacy that, perhaps, Severus neither wants nor has ever had; and "coward," which would be a near killing word. *hides*
I don't think that Severus would share what turned him on, so I muffled his reply.
These are the sounds that we believe Severus loves: [Muffled]'s voice, the "first day of summer" silence of Hogwarts, that indrawn breath as he enters a room, silence, softly simmering potions (or bubbling cauldrons if one prefers), and classical music.
These are the sounds that we believe Severus hates: Potter's voice, cauldrons exploding, that indrawn breath as he enters a room, children in large groups/classrooms, "Erm...professor...," and chattering/cheery children.
I'm interested to see that "fuck" didn't make it on to the list of Severus' favorite curse word, but these words (and phrases) did:
Potter!
"Detention!"
Sod it
Shite
"Well bugger me with a toasting fork."
dunderhead
Of the professions other than his own that Severus would like to attempt,
We think that Severus would hate teaching, being a self-help guru, doing the Welcome Witch's job, and child minding/nannying/child care of any kind (unless he's were caring for his own children).
If heaven exists, two of us think that what Severus would like to hear God say when he arrives at the pearly gates is "Welcome." One of us thinks it's "Well done." Our other thoughts are "I apologise," "I see you and accept you," and "Actually, neither Tom nor Albus made here it!"
All that said, as Severus is not dead and will not be dying anytime soon thanks to fandom, he won't have a chance to discover what God might greet him with at the pearly gates. *firm*