2 words in this vocabulary list
noun a person born on February 29th, a leap year
noun A word that represents a person, place, thing, or idea. In this case, 'half birthday' is a noun as it represents a specific type of celebration.
adjective A word that describes or modifies a noun. In this case, 'half' is an adjective as it describes the type of birthday being celebrated, which is midway between two annual birthdays.