ODD ONE OUT IV

One of the words in the list below is not like the others. Which word does not belong, and why?

SLOOPS
SWOOPS
SNOOPS

Answer:

SWOOPS does not belong in this group. The other two words are perfect anagrams. That is, they can be read in reverse to spell other words:

SLOOPS - SPOOLS
SNOOPS - SPOONS