father surrogate vs father figure

father surrogate and father figure both are nouns.

Word	Noun	Adjective	Verb	Adverb
father surrogate	Yes	No	No	No
father figure	Yes	No	No	No

As nouns, father surrogate and father figure are synonyms defined as:

father surrogate and father figure: a man who takes over all the functions of the real father

father surrogate (noun)	father figure (noun)
a man who takes over all the functions of the real father	a man who takes over all the functions of the real father