adoptive father(man who has adopted a child) noun [UK: ə.ˈdɒp.tɪv ˈfɑːð.ə(r)] [US: ə.ˈdɑːp.tɪv ˈfɑːð.r̩]
foster father(an adult male who cares for a foster child) noun
foster parent [foster parents](adult who cares for a child who has been placed in foster care) noun [UK: ˈfɒ.stə(r) ˈpeə.rənt] [US: ˈfɑː.stər ˈpe.rənt]