Four letter-cluster have been given out of which three are alike in some manner, while one is different. Choose the odd one.

NOQST

NOQST  = N → (+1) → O → (+2 ) → Q → (+2) →S → (+1) →T ( THIS IS ODD)

EGIKM = E → (+2) → G → (+2 ) → I → (+2) →K → (+2) →M

BDFHJ = B → (+2) → D → (+2 ) → F → (+2) →H → (+2) →J

QSUWY = Q → (+2) → S → (+2 ) → U → (+2) → W → (+2) →Y