whiskers vs stubble

whiskers and stubble both are nouns.

Word	Noun	Adjective	Verb	Adverb
whiskers	Yes	No	No	No
stubble	Yes	No	No	No

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

whiskers: the hair growing on the lower part of a man's face
stubble: short stiff hairs growing on a man's face when he has not shaved for a few days

Other hyponyms of whiskers include fuzz, imperial, imperial beard, beaver, goatee, vandyke, vandyke beard, Attilio, soul patch.

whiskers (noun)	stubble (noun)
the hair growing on the lower part of a man's face	short stiff hairs growing on a man's face when he has not shaved for a few days
	material consisting of seed coverings and small pieces of stem or leaves that have been separated from the seeds