As an artificial language with a focus on regularity and facilitation of language acquisition, Esperanto was designed with a morphology that allows (almost) free, productive combination of roots, affixes and inflexion endings.
the root 'san' (healthy) not only accepts its prototypical adjectival ending '-a', but also other part-ofspeech endings ('san|e' -healthily, 'san|on' -cheers) 1 , as well as prefixes ('mal+san|a' -unhealthy [mal=opposite]), suffixes ('sanigi' -cure [ig=make]) or multiple affixes ('mal+san+ul+ej|o' -hospital [ul=person, ej=place]).