Beard refers to the hair that grows on men's upper lip, chin, cheeks, cheeks or neck. Beard means the beard on the top of the mouth, so compared with these two words, the scope of beard is wider, including not only the beard on the top of the mouth, but also the hair on other parts.
"Hu" originally refers to the hair growing on the mouth, and the upper lip is called "mustache" (also called "moustache", "moustache" and "chicken with two lips" in Cantonese).