Further word-level revision

A word family is a group of words common in feature, pattern or meaning. Prefixes and suffixes can build word families. A synonym is a word with the same or similar meaning to another word and an antonym has the opposite meaning. A pronoun is a word that we use in place of a noun to avoid repetition. A possessive pronoun is a type of pronoun that denotes possession of a noun by another noun. A preposition is a word that connects a sentence to a noun or noun phrase to show where/when/why something's happening.