slipper vs footwear

slipper and footwear both are nouns.

Word	Noun	Adjective	Verb	Adverb
slipper	Yes	No	No	No
footwear	Yes	No	No	No

As nouns, footwear is a hypernym of slipper; that is, footwear is a word with a broader meaning than slipper:

slipper: low footwear that can be slipped on and off easily; usually worn indoors
footwear: covering for a person's feet

Other hypernyms of slipper include footgear.

slipper (noun)	footwear (noun)
low footwear that can be slipped on and off easily; usually worn indoors	covering for a person's feet
a person who slips or slides because of loss of traction	clothing worn on a person's feet