I remember it very well that this question for same plant identification was posted last year in the month of June also. At that time several experts have suggested it as Pachira glabra of family Malvaceae.
I agree with Dr Alain.... It's definitely an Euphorbiaceae plant judging from the flowers, and it looks very similar to species of Ricinodendron or Hevea. Please consult "Flora of West Tropical Africa, Volume II" - Hutchinson and Dalziel (1963)