guvnor vs boss

guvnor and boss both are nouns.

Word	Noun	Adjective	Verb	Adverb
guvnor	Yes	No	No	No
boss	Yes	Yes	Yes	No

As nouns, boss is a hypernym of guvnor; that is, boss is a word with a broader meaning than guvnor:

Other hypernyms of guvnor include hirer.

guvnor (noun)	boss (noun)
(British slang) person in command	a circular rounded projection or protuberance
	a person responsible for hiring workers
	a person who exercises control over workers
	a leader in a political party who controls votes and dictates appointments
	a person who exercises control and makes decisions

guvnor (adjective)	boss (adjective)
	exceptionally good

guvnor (verb)	boss (verb)
	raise in a relief