tyrannise vs bully

tyrannise is not a noun while bully is a noun.

Word	Noun	Adjective	Verb	Adverb
tyrannise	No	No	Yes	No
bully	Yes	Yes	Yes	No

As verbs, bully is a hypernym of tyrannise; that is, bully is a word with a broader meaning than tyrannise:

tyrannise: rule or exercise power over (somebody) in a cruel and autocratic manner
bully: be bossy towards

Other hypernyms of tyrannise include ballyrag, boss around, browbeat, bullyrag, hector, push around, strong-arm.

tyrannise (noun)	bully (noun)
	a cruel and brutal fellow
	a hired thug

tyrannise (adjective)	bully (adjective)
	excellent

tyrannise (verb)	bully (verb)
rule or exercise power over (somebody) in a cruel and autocratic manner	discourage or frighten with threats or a domineering manner; intimidate
rule a country as a tyrant	be bossy towards