footwear vs clog

footwear and clog both are nouns.

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

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

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

footwear (noun)	clog (noun)
covering for a person's feet	a dance performed while wearing shoes with wooden soles; has heavy stamping steps
clothing worn on a person's feet	any object that acts as a hindrance or obstruction
	footwear usually with wooden soles

footwear (verb)	clog (verb)
	impede with a clog or as if with a clog
	fill to excess so that function is impaired
	coalesce or unite in a mass
	become or cause to become obstructed
	impede the motion of, as with a chain or a burden
	dance a clog dance