white-haired vs hoary

white-haired and hoary both are adjectives.

Word	Noun	Adjective	Verb	Adverb
white-haired	No	Yes	No	No
hoary	No	Yes	No	No

As adjectives, white-haired and hoary are synonyms defined as:

white-haired and hoary: showing characteristics of age, especially having grey or white hair

Other synonyms of white-haired include gray-haired, gray-headed, gray, grey-haired, grey-headed, grey, grizzly, hoar.

white-haired (adjective)	hoary (adjective)
favorite	covered with fine whitish hairs or down
showing characteristics of age, especially having grey or white hair	ancient
	showing characteristics of age, especially having grey or white hair