theologist vs Father

theologist and Father both are nouns.

Word	Noun	Adjective	Verb	Adverb
theologist	Yes	No	No	No
Father	Yes	No	No	No

As nouns, Father is a hyponym of theologist; that is, Father is a word with a more specific, narrower meaning than theologist:

theologist: someone who is learned in theology or who speculates about theology
Father: (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

theologist (noun)	Father (noun)
someone who is learned in theology or who speculates about theology	`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
	God when considered as the first person in the Trinity
	(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