A neighbourhood is a thing , a noun.
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
The part of speech for "explicit" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "rapid" is an adjective.
"an old neighborhood/neighbourhood" can be an adjective nor a phrase Is "an old neighbourhood" really a figure of speech? My understanding is that the words "an old neighbourhood" should be taken literally, as being a neighbourhood (i.e., community) that has existed for a long time. It might, in some circumstances, refer to a run-down neighbourhood, but I don't think this is necessarily so.
In my neighbourhood a big mansion is visible behind all the small houses. Mansion (definition): Villa, big house
The Neighbourhood
Neighbourhood
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "twirl" is a verb.