footwear vs boot

footwear and boot both are nouns.

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

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

Other hyponyms of footwear include clog, geta, patten, sabot, flats, overshoe, shoe, carpet slipper, slipper.

footwear (noun)	boot (noun)
covering for a person's feet	the act of delivering a blow with the foot
clothing worn on a person's feet	a form of foot torture in which the feet are encased in iron and slowly crushed
	footwear that covers the whole foot and lower leg
	compartment in an automobile that carries luggage or shopping or tools
	an instrument of torture that is used to heat or crush the foot and leg
	protective casing for something that resembles a leg
	the swift release of a store of affective force

footwear (verb)	boot (verb)
	cause to load (an operating system) and start the initial processes
	kick; give a boot to