woodland caribou vs caribou

woodland caribou and caribou both are nouns.

Word	Noun	Adjective	Verb	Adverb
woodland caribou	Yes	No	No	No
caribou	Yes	No	No	No

As nouns, caribou is a hypernym of woodland caribou; that is, caribou is a word with a broader meaning than woodland caribou:

woodland caribou: any of several large caribou living in coniferous forests of southern Canada; in some classifications included in the species Rangifer tarandus
caribou: Arctic deer with large antlers in both sexes; called `reindeer' in Eurasia and `caribou' in North America

Other hypernyms of woodland caribou include Greenland caribou, Rangifer tarandus, reindeer.

woodland caribou (noun)	caribou (noun)
any of several large caribou living in coniferous forests of southern Canada; in some classifications included in the species Rangifer tarandus	Arctic deer with large antlers in both sexes; called `reindeer' in Eurasia and `caribou' in North America