linen vs household linen

linen and household linen both are nouns.

Word	Noun	Adjective	Verb	Adverb
linen	Yes	No	No	No
household linen	Yes	No	No	No

As nouns, household linen is a hypernym of linen; that is, household linen is a word with a broader meaning than linen:

linen: white goods or clothing made with linen cloth
household linen: drygoods for household use that are typically made of white cloth

Other hypernyms of linen include white goods.

linen (noun)	household linen (noun)
white goods or clothing made with linen cloth	drygoods for household use that are typically made of white cloth
a fabric woven with fibers from the flax plant
a high-quality paper made of linen fibers or with a linen finish