“Buttons,” “collar,” and “sleeves” are common, countable, concrete nouns; “month” is an abstract countable noun; and “thousand years” takes the singular verb “is” (as in “It’s maybe a thousand years old”) because it acts as a single unit.

“Class” is a common, concrete, collective noun in the singular; “coatroom” is a compound common noun; and “everybody” and “nobody” are indefinite pronouns functioning as noun equivalents.

“Sweater” is a common, countable, concrete noun in the singular; “Mrs. Price” is a proper noun with feminine gender; and the genitive form “sweater’s” (in “the red sweater’s still sitting”) indicates possession.

“Mama” and “Papa” are proper nouns with inherent gender; “cake” is a common, countable, concrete noun; and “birthday” in “Happy birthday” acts as a common abstract noun in a vocative exclamation.

“Desk,” “ruler,” “pencil,” “books,” “eraser,” and “chair” are common, countable, abstract nouns; and “math” (as in “math problem”) is a common noun.