academic departments: Lowercase except for words that are proper nouns or adjectives. The marketing department; the department of English.
ballpoint pen: Proper style for students’ writing instruments.
bus, buses: Proper style for the transportation vehicles. The verb forms: bus, bused and busing. Add an extra s, and you’re insinuating kissing.
chapter: Capitalize when used with a numeral in reference to a section of a book or legal code. Always use Arabic figures. Chapter 1, Chapter 20. Lowercase when standing alone. The book chapters are short.
day care: Two words, no hyphen in all uses.
dean’s list: Lowercase in all uses. He is on the dean’s list for fall semester. She is a dean’s list student.
encyclopedia: Lowercase, but follow the spelling of formal names: Encyclopedia Britannica.