hair vs hairsbreadth

hair and hairsbreadth both are nouns.

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

As nouns, hair and hairsbreadth are synonyms defined as:

Other synonyms of hair include hair's-breadth, whisker.

hair (noun)	hairsbreadth (noun)
a filamentous projection or process on an organism	a very small distance or space
cloth woven from horsehair or camelhair; used for upholstery or stiffening in garments
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
any of the cylindrical filaments characteristically growing from the epidermis of a mammal
filamentous hairlike growth on a plant
a very small distance or space