The term 'Father, Son and Holy Ghost' is a reference to the Christian concept of the Trinity, which is the belief that God is three persons in one. The two crossword solutions for this term are 'TRINE' (5 letters) and 'TRIUNE' (6 letters). Both words refer to the same concept, with 'TRINE' being an older form of the word and 'TRIUNE' being more modern. The terms refer to the three persons of the Trinity: Father, Son and Holy Ghost.