The term 'presumptive person' refers to an individual who is expected to inherit a title or position of power. The crossword solution for this term is 'HEIR', which is a four-letter word. An HEIR is someone who is legally entitled to receive the property or title of another person upon their death. In some cases, an HEIR may be appointed by the deceased person in their will. In other cases, the HEIR may be determined by law.