father figure vs father surrogate

father figure and father surrogate both are nouns.

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

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

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

father figure (noun)	father surrogate (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