pourboire vs perquisite

pourboire and perquisite both are nouns.

Word	Noun	Adjective	Verb	Adverb
pourboire	Yes	No	No	No
perquisite	Yes	No	No	No

As nouns, perquisite is a hypernym of pourboire; that is, perquisite is a word with a broader meaning than pourboire:

pourboire: a relatively small amount of money given for services rendered (as by a waiter)
perquisite: an incidental benefit awarded for certain types of employment (especially if it is regarded as a right)

Other hypernyms of pourboire include fringe benefit, perk.

pourboire (noun)	perquisite (noun)
a relatively small amount of money given for services rendered (as by a waiter)	a right reserved exclusively by a particular person or group (especially a hereditary or official right)
	an incidental benefit awarded for certain types of employment (especially if it is regarded as a right)