local road vs local street

local road and local street both are nouns.

Word	Noun	Adjective	Verb	Adverb
local road	Yes	No	No	No
local street	Yes	No	No	No

As nouns, local road and local street are synonyms defined as:

local road and local street: a street that is primarily used to gain access to the property bordering it

local road (noun)	local street (noun)
a street that is primarily used to gain access to the property bordering it	a street that is primarily used to gain access to the property bordering it