Nissen hut vs army hut

Nissen hut and army hut both are nouns.

Word	Noun	Adjective	Verb	Adverb
Nissen hut	Yes	No	No	No
army hut	Yes	No	No	No

As nouns, army hut is a hypernym of Nissen hut; that is, army hut is a word with a broader meaning than Nissen hut:

Nissen hut: a prefabricated hut of corrugated iron having a semicircular cross section
army hut: temporary military shelter

Other hypernyms of Nissen hut include field hut, hut.

Nissen hut (noun)	army hut (noun)
a prefabricated hut of corrugated iron having a semicircular cross section	temporary military shelter