Words of assurance are phrases that provide comfort and security to someone. They can be used to reassure someone in a difficult situation or to encourage them to keep going. The two crossword solutions for the term 'words of assurance' are IDO (3 letters) and ICAN (4 letters). IDO stands for 'I do believe' and ICAN stands for 'I can do it'. These two phrases are often used to provide words of assurance to someone, as they express a sense of belief and capability.