Depends on how you are using it. It is either a noun or verb.
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"Crossing" can be a verb (e.g., "They are crossing the street") or a noun (e.g., "The crossing is marked with yellow lines").
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 "twirl" is a verb.
The part of speech for "unfamiliar" is an adjective.