different between naphtol vs naphthol

English

naphtol (plural naphtols)

Archaic form of naphthol.
- 1883, The American Journal of the Medical Sciences
  This was used as a soap with hot water to cleanse the scalp once daily, a small portion of lather being allowed to dry on the scalp. At a later date a solution of naphtol in alcohol, twenty grains to the ounce (4 per cent.), was employed […]

naphthol (countable and uncountable, plural naphthols)

(organic chemistry) Either of two isomeric phenols derived from naphthalene; they are used in the preparation of dyes and many other compounds

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