Frozen and Northbound

Frozen adjective - Firmly positioned in place and difficult to dislodge.

Northbound and frozen are semantically related In some cases you can use "Northbound" instead an adverb "Frozen".

Northbound adjective - Moving toward the north.

Frozen and northbound are semantically related in toward the top pole of the earth topic. You can use "Frozen" instead an adverb "Northbound".