Choose or find odd word - Seminar , Semicolon , Semifinal , Semicircle , Semitone

A. SEMINAR

Choose or find odd number pair - (80 - 9) , (64 - 8) , (36 - 6) , (7 - 49)

A. 80 - 9

Choose or find odd word - Wood , Cork , Stone , Paper

C. STONE

Choose or find odd letter group - USAGE , USUAL , UKASE , URINE

B. USUAL

Choose or find odd pair of words - (Scalpel : Surgeon) , (Chisel : Soldier) , (Awl : Cobbler) , (Knife : Chef)

B. CHISEL : SOLDIER