peremptory vs high-and-mighty

peremptory and high-and-mighty both are adjectives.

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

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

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

Other synonyms of peremptory include autocratic, bossy, dominating, magisterial.

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