back door vs access

back door and access both are nouns.

Word	Noun	Adjective	Verb	Adverb
back door	Yes	No	No	No
access	Yes	No	Yes	No

As nouns, access is a hypernym of back door; that is, access is a word with a broader meaning than back door:

As nouns, access is a hypernym of back door; that is, access is a word with a broader meaning than back door:

back door: an undocumented way to get access to a computer system or the data it contains
access: a code (a series of characters or digits) that must be entered in some way (typed or dialed or spoken) to get the use of something (a telephone line or a computer or a local area network etc.)

Other hypernyms of back door include access code.

back door (noun)	access (noun)
a secret or underhand means of access (to a place or a position)	the act of approaching or entering
an entrance at the rear of a building	a way of entering or leaving
an undocumented way to get access to a computer system or the data it contains	(computer science) the operation of reading or writing stored information
	the right to enter
	the right to obtain or make use of or take advantage of something (as services or membership)
	a code (a series of characters or digits) that must be entered in some way (typed or dialed or spoken) to get the use of something (a telephone line or a computer or a local area network etc.)

back door (verb)	access (verb)
	reach or gain access to
	obtain or retrieve from a storage device; as of information on a computer