"hoar" in the noun sense
1. frost, hoar, hoarfrost, rime
ice crystals forming a white deposit (especially on objects outside)
"hoar" in the adjective sense
1. grey, gray, grey-haired, gray-haired, grey-headed, gray-headed, grizzly, hoar, hoary, white-haired
showing characteristics of age, especially having grey or white hair
"whose beard with age is hoar"-Coleridge
"nodded his hoary head"
Source: WordNet® (An amazing lexical database of English)
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