The word "least" is an adjective that denotes the lowest in importance or degree. Synonyms for least include minimal, smallest, lowest, tiniest, slightest, and negligible. These words can be used interchangeably with least, depending on the context. For example, instead of saying "the least important factor," we can say "the minimal factor" or "the smallest factor." Likewise, "the least significant difference" can be replaced with "the smallest difference" or "the slightest difference." It is essential to have a variety of synonyms at our disposal to express ourselves fluently and accurately in written and spoken communication.