съставна част означава в английски

constituent [constituents]▼(part, or component of a whole)
noun
[UK: kən.ˈstɪ.tjʊənt] [US: kən.ˈstɪ.tʃuːənt]

component [components]▼(smaller, self-contained part of larger entity)
noun
[UK: kəm.ˈpəʊ.nənt] [US: kəmˈpo.ʊ.nənt]

ingredient [ingredients]▼(substance present in a mixture)
noun
[UK: ɪn.ˈɡriː.dɪənt] [US: ɪŋ.ˈɡriː.diənt]