No, there are multiple forms of trespass. For example "Trespass to Chattels" is a form of trespass wherein a party intentionally interferes with another person's lawful possession over a chattel...
A person is a single individual. Persons can refer to a group of people.Depending on the context, it may also be used to describe the body of an individual.E.g. "The spider is now upon my person"...