Is crossing a common noun or a proper noun?

Answer 1

When used as a noun ("meet me at the crossing") it is a common noun. Proper nouns are usually names of people, places or things--and are almost always capitalized. If Crossing was the name of a company or restaurant or town, it would be considered a proper noun and capitalized.

Answer 2

The word 'crossed' is the past participle, past tense of the verb 'to cross' (cross, crossing, crossed). The past participle of the verb is also an adjective, for example, crossed bridges. The word 'cross' is also an adjective, for example a cross teacher.

The word cross (crosses) is also a noun, for example, 'That's a cross that I must bear.'

The noun forms for the verb to cross are crosser and the gerund, crossing.