It can be either a concrete or abstract noun, depending on its use. When referring to the page on which a poem is written or typed, it is concrete.
Yes
No, he is a pronoun, it represents a concrete noun, a male person or animal.
A concrete poem is where you write the words related to a letter or picture and write the lines to form the letter or picture.
Yes, people is a concrete noun. A concrete noun is something that can be experienced by one or more of your five senses, seeing, hearing, touching, tasting, or smelling.
Concrete.