Greenland whale vs baleen whale

Greenland whale and baleen whale both are nouns.

Word	Noun	Adjective	Verb	Adverb
Greenland whale	Yes	No	No	No
baleen whale	Yes	No	No	No

As nouns, baleen whale is a hypernym of Greenland whale; that is, baleen whale is a word with a broader meaning than Greenland whale:

Greenland whale: large-mouthed Arctic whale
baleen whale: whale with plates of whalebone along the upper jaw for filtering plankton from the water

Other hypernyms of Greenland whale include whalebone whale.

Greenland whale (noun)	baleen whale (noun)
large-mouthed Arctic whale	whale with plates of whalebone along the upper jaw for filtering plankton from the water