hut vs Nissen hut

hut and Nissen hut both are nouns.

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

As nouns, Nissen hut is a hyponym of hut; that is, Nissen hut is a word with a more specific, narrower meaning than hut:

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

Other hyponyms of hut include Quonset hut.

hut (noun)	Nissen hut (noun)
small crude shelter used as a dwelling	a prefabricated hut of corrugated iron having a semicircular cross section
temporary military shelter