hoary vs white-haired

hoary and white-haired both are adjectives.

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

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

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

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

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