house-to-house vs door-to-door

house-to-house and door-to-door both are adjectives.

Word	Noun	Adjective	Verb	Adverb
house-to-house	No	Yes	No	No
door-to-door	No	Yes	No	No

As adjectives, house-to-house and door-to-door are synonyms defined as:

house-to-house and door-to-door: omitting no one; from the door of one house to that of the next

house-to-house (adjective)	door-to-door (adjective)
omitting no one; from the door of one house to that of the next	omitting no one; from the door of one house to that of the next
	(of e.g. journeys or deliveries) direct from point of origin to point of destination