door-to-door vs house-to-house

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

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

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

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

door-to-door (adjective)	house-to-house (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