mightyship means A term of address for a powerful person. Lexicurio rates it Sui generis — a strength score of 99 out of 100.
Etymology
From mighty + -ship.
noun
- A term of address for a powerful person.“Is it fit, let your mightyship say, / That I, like some pitiful flirt, / Should tarry within doors all day, / Or else trudge it afoot in the dirt?”