different between unbolt vs unbar

English

un- +? bolt

unbolt (third-person singular simple present unbolts, present participle unbolting, simple past and past participle unbolted)

(transitive) To unlock by undoing the bolts of.
- c. 1601, William Shakespeare, Troilus and Cressida, Act IV, Scene 2,^[1]
  Then, sweet my lord, I’ll call mine uncle down;
  He shall unbolt the gates.

From Middle English unbarren, equivalent to un- +? bar.

unbar (third-person singular simple present unbars, present participle unbarring, simple past and past participle unbarred)

(transitive) To unlock or unbolt a door that had been locked or bolted with a bar.
(transitive) To remove an impediment that obstructs the passage of (someone or something).
(transitive) To remove a prohibition.

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