WordNet sense 1 (a person who founds or establishes some institution):

beginner, founder, Founding Father

WordNet sense 2 (the founder of a family):

forefather, sire

WordNet sense 3 (`Father' is a term of address for priests in some churches (especially the Roman Catholic Church or the Orthodox Catholic Church); `Padre' is frequently used in the military):

padre

WordNet sense 4 (a male parent (also used as a term of address to your father)):

begetter, male parent

WordNet sense 5 (the head of an organized crime family):

don

WordNet sense 6 ((Christianity) any of about 70 theologians in the period from the 2nd to the 7th century whose writing established and confirmed official church doctrine; in the Roman Catholic Church some were later declared saints and became Doctor of the Church; the best known Latin Church Fathers are Ambrose, Augustine, Gregory the Great, and Jerome; those who wrote in Greek include Athanasius, Basil, Gregory Nazianzen, and John Chrysostom):

Church Father, Father of the Church

WordNet sense 7 (God when considered as the first person in the Trinity):

fatherhood, Father-God

WordNet sense 8 (make children):

beget, engender, generate, get, mother, mother, bring forth