high-and-mighty vs peremptory

high-and-mighty and peremptory both are adjectives.

Word	Noun	Adjective	Verb	Adverb
high-and-mighty	No	Yes	No	No
peremptory	No	Yes	No	No

As adjectives, high-and-mighty and peremptory are synonyms defined as:

high-and-mighty and peremptory: offensively self-assured or given to exercising usually unwarranted power

Other synonyms of high-and-mighty include autocratic, bossy, dominating, magisterial.

high-and-mighty (adjective)	peremptory (adjective)
offensively self-assured or given to exercising usually unwarranted power	putting an end to all debate or action
	offensively self-assured or given to exercising usually unwarranted power
	not allowing contradiction or refusal