white-haired vs gray-headed

white-haired and gray-headed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
white-haired	No	Yes	No	No
gray-headed	No	Yes	No	No

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

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

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

white-haired (adjective)	gray-headed (adjective)
favorite	showing characteristics of age, especially having grey or white hair
showing characteristics of age, especially having grey or white hair