The term 'HEART, FOR ONE' can be solved by three crossword solutions: PUMP (4 letters), ORGAN (5 letters), and INTERNALORGAN (13 letters). The first solution, PUMP, is a verb meaning to move or operate with a rhythmical action. The second solution, ORGAN, is a noun referring to a part of the body that performs a specific function. The third solution, INTERNALORGAN, is a noun referring to an ORGAN located inside the body. The heart is one of the most important internal organs in the human body, as it pumps blood throughout the body and helps to maintain life.