No. It is a verb or a noun. The noun may be used as a noun adjunct (like an adjective), e.g. "park ranger" or park bench.
Adverb
No, park can be used as a noun and a verb.Noun: We went to the park today.Verb: We could not park the car.
Underground is an adverb, as in beneath the surface of the ground. It is an adjective, as in an underground car park
Yes, it can. In is an adverb in the sentence "I will go in" although where the person goes "in" (into) is not defined. With an object noun, in is a preposition, and a phrase could be an adverb or an adjective phrase. E.g. I went in the park. The fountain in the park is broken.
adverb
Adverb
No, "she has spoken" is a verb phrase. An adverb phrase modifies a verb, adjective, or adverb by providing additional information about time, manner, place, or degree. For example, "quietly in the park" or "very quickly."
"Near" can be used as an adverb to describe the location of something in relation to another object or place. For example, "The store is located near the park," uses "near" to indicate the proximity of the store to the park.
The infinitive phrase in the sentence "We met at the park to run" is "to run." This phrase functions as an adverb, explaining the purpose of the meeting at the park. It indicates the intention behind their gathering.
I'm about 90% certain it is an adverb. About can serve as an adverb, preposition or adjective. I'm 99.9999999999999% certain it isn't an adjective as used here, but preposition or adverb depends on whether there is anything more to the sentence: He wandered about (aimlessly) => about is an adverb He wandered about the park => about is a preposition
The infinitive phrase plays the role of an adverb in this sentence. It tells why you met at the park. In the sentence "You met at the park to run", "to run" is the infinitive phrase.
No, legally is an adverb, a word that modifies a verb. Example sentence:You can't legally park on this street.