igloo vs hovel

igloo and hovel both are nouns.

Word	Noun	Adjective	Verb	Adverb
igloo	Yes	No	No	No
hovel	Yes	No	No	No

As nouns, hovel is a hypernym of igloo; that is, hovel is a word with a broader meaning than igloo:

igloo: an Eskimo hut; usually built of blocks (of sod or snow) in the shape of a dome
hovel: small crude shelter used as a dwelling

Other hypernyms of igloo include hut, hutch, shack, shanty.

igloo (noun)	hovel (noun)
an Eskimo hut; usually built of blocks (of sod or snow) in the shape of a dome	small crude shelter used as a dwelling