Highway Code vs code

Highway Code and code both are nouns.

Word	Noun	Adjective	Verb	Adverb
Highway Code	Yes	No	No	No
code	Yes	No	Yes	No

As nouns, code is a hypernym of Highway Code; that is, code is a word with a broader meaning than Highway Code:

Other hypernyms of Highway Code include codification.

Highway Code (noun)	code (noun)
the code of rules governing the use of public roads	a coding system used for transmitting messages requiring brevity or secrecy
	a set of rules or principles or laws (especially written ones)
	(computer science) the symbolic arrangement of data or instructions in a computer program or the set of such instructions
	a series of letters, numbers or symbols assigned to something for the purpose of classification or identification

Highway Code (verb)	code (verb)
	convert ordinary language into code
	attach a code to