hair vs beard

hair and beard both are nouns.

Word	Noun	Adjective	Verb	Adverb
hair	Yes	No	No	No
beard	Yes	No	Yes	No

As nouns, beard is a hyponym of hair; that is, beard is a word with a more specific, narrower meaning than hair:

hair: a covering for the body (or parts of it) consisting of a dense growth of threadlike structures (as on the human head); helps to prevent heat loss
beard: hairy growth on or near the face of certain mammals

As nouns, beard is a hyponym of hair; that is, beard is a word with a more specific, narrower meaning than hair:

hair: filamentous hairlike growth on a plant
beard: a tuft or growth of hairs or bristles on certain plants such as iris or grasses

Other hyponyms of hair include stinging hair.

hair (noun)	beard (noun)
a filamentous projection or process on an organism	tuft of strong filaments by which e.g. a mussel makes itself fast to a fixed surface
cloth woven from horsehair or camelhair; used for upholstery or stiffening in garments	hairy growth on or near the face of certain mammals
a covering for the body (or parts of it) consisting of a dense growth of threadlike structures (as on the human head); helps to prevent heat loss	the hair growing on the lower part of a man's face
any of the cylindrical filaments characteristically growing from the epidermis of a mammal	a person who diverts suspicion from someone (especially a woman who accompanies a male homosexual in order to conceal his homosexuality)
filamentous hairlike growth on a plant	a tuft or growth of hairs or bristles on certain plants such as iris or grasses
a very small distance or space

hair (verb)	beard (verb)
	go along the rim, like a beard around the chin