As adjectives the difference between northmost and northernmost
is that northmost is furthest to the north; most northern while northernmost is farthest north.
northmost
English
Adjective
(-)
Furthest to the north; most northern.
Antonyms
* southmost
northernmost
English
Adjective
(-)
Farthest north.
:Alaska is the northernmost American state.
See also
*southernmost
*westernmost
*easternmost