This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Archaic A third person singular present tense of do1.

v. Third-person singular simple present indicative form of do; does.

"[1.] He that hearest you, and regardeth what you say, heareth me, and herein doeth me honour."

doth   

lawfull    dooth    groweth    requireth    sworne    giue    beare    oughte    haue    beyng