The eight words below can be arranged into two groups of four according to a certain pattern. What is the pattern and which words are in each group?

ORE

FIR

BUR

ITCH

HONE

CLOSE

RANGE 

AIRWAY 

Answer:

 

The two groups can be arranged according to which words can be preceded by ST and which words followed by ST to make new words:

 

STORE                 FIRST

STITCH               BURST

STRANGE           HONEST

STAIRWAY         CLOSEST