Chimneys is the plural form of the noun chimney.
Steeplejacks construct steeples and chimneys. They also clean chimneys. So they would be part of the construction trade.
The plural form of the noun chimney is chimneys. The plural possessive form is chimneys'.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
what part of speech is beneath
adverb
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.
The part of speech of "came" is a verb.
The part of speech for "breezy" is an adjective.