The word 'require' is a common verb that refers to the need or demand for something. It is extensively used in the English language in various contexts, including formal and informal writing, business, education, and personal communication. Some common synonyms for 'require' include necessitate, demand, need, mandate, entail, oblige, and call for. While these words may differ in their level of formality, they all convey the meaning of a necessity or compulsory requirement. By using these synonyms, one can add variety to their writing and make it more engaging and expressive, while maintaining the original meaning and context of the sentence.