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.
The workweek and weekend are those complementary parts of the week devoted to labour and rest, respectively. The legal working week (British English), or workweek (American English), is the part of the seven-day week devoted to labour. In most of the Western world, it is Monday to Friday; the weekend is Saturday and Sunday. A weekday is any day of the working week. Other institutions often follow the same days, such as places of education. In some Christian traditions, Sunday is the day of rest and worship.