HTTP vs protocol

HTTP and protocol both are nouns.

Word	Noun	Adjective	Verb	Adverb
HTTP	Yes	No	No	No
protocol	Yes	No	No	No

As nouns, protocol is a hypernym of HTTP; that is, protocol is a word with a broader meaning than HTTP:

HTTP: a protocol (utilizing TCP) to transfer hypertext requests and information between servers and browsers
protocol: (computer science) rules determining the format and transmission of data

Other hypernyms of HTTP include communications protocol.

HTTP (noun)	protocol (noun)
a protocol (utilizing TCP) to transfer hypertext requests and information between servers and browsers	code of correct conduct
	forms of ceremony and etiquette observed by diplomats and heads of state
	(computer science) rules determining the format and transmission of data