No. The word "elevator" can be a noun ("Get on the elevator!") or more rarely an adjective ("Check out my new elevator shoes.")
*uses such as elevator shoes or elevator shaft may be considered a noun adjunct rather than an adjective
Quickly is definitely an adverb. Long *can* be an adverb but before nouns and after linking verbs it is an adjective. Tripped is a verb or adjective. Elevator and tree are nouns.
Yes, enough is an adverb of degree. It can be used as adjective also. Examples: The building is tall enough to need an elevator. (adverb) We did not have enough rope (adjective)
It can be either, depending on whether it has an object. "He climbed up the mountain" (preposition, object mountain) "He entered the elevator and went up" (adverb, no object).
In the given sentence, many (adjective), passengers (noun), stood (verb), as(conjunction), the (article), elevator (noun) and moved (verb) are not adverbs.It would seem easier to name the 3 adverbs:The adverb silently modifies the verb stood.The adverb downward modifies the verb moved.The adverb quickly modifies the verb moved. (it is a pair, rather than modifying the other adverb).
get in an elevator
It has no steps!
Not necessarily. An hydraulic elevator (as in mining), or a grain elevator would not be pulleys. Nor elevator shoes.
The elevator ('lift' in the UK). He did not invent the elevator(lift). He invented the elevator brake system.
Elevator shaft.
Elevator with an Australian accent.
Elevators is the plural of elevator
the Otis-dominated elevator industry kept pace with developments of its own, introducing the hydraulic elevator in 1878, the electric elevator in 1889, and the gearless traction electric elevator in 1903.