A ZIP+4 code uses the basic 02119 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Roxbury city block, a group of apartments, an individual high-volume receiver of mail or any other unit that could use an extra identifier to aid in efficient mail sorting and delivery in Massachusetts.
A proper noun is different from a pronoun. Days of the week are always capitalized and are proper nouns. Names of cities and names of people are proper nouns. Pronouns are words like he, she, it, you, yours. Yes, the days of the week are proper nouns and always capitalized. Pronouns are a class of words used to refer to other specific nouns. The most common English pronouns include he, she, it, me, I, us, we, you, they and them. If you capitalize it in the middle of a sentence, it's (generally) a proper noun.
(In this example, East is not part of a proper noun. Keep driving north on the M1 until you reach the M62 and then head west towards West Yorkshire. The North, The East, The South, and The West. The geographical areas The North, The East, The South, and The West are considered proper nouns. They should be written with capital letters.