Hoar has 6 different meanings across 3 categories:
Noun · Adjective · Proper Noun
ice crystals forming a white deposit (especially on objects outside)
A white or greyish-white colour.
To become mouldy or musty.
showing characteristics of age, especially having grey or white hair
"whose beard with age is hoar"
"nodded his hoary head"
Of a white or greyish-white colour.
A surname.