Nouns

(n)humanitarian, do-gooder, improversomeone devoted to the promotion of human welfare and to social reforms
(n)humanist, humanitarianan advocate of the principles of humanism; someone concerned with the interests and welfare of humans

Adjectives

(a)humanitarianof or relating to or characteristic of humanitarianism“humanitarian aid”
(s)human-centered, human-centred, humanist, humanistic, humanitarianmarked by humanistic values and devotion to human welfare“released the prisoner for humanitarian reasons”, “respect and humanistic regard for all members of our species”