dirty / pollute / disgrace / rape / defile

dirty

cinders, ashes / leftovers

shell

an egg

an egg, including fish roe / the beginning or start of something (compare the uses of English terms kernel and seed) / a beginner or rookie at something

an ovum

pretty, gorgeous, beautiful / clear, clean, pure / clean, not dirty / tidy, neat, everything put away / fair, impartial, of clear conscience

lip service; promising but empty talk / skillful completion of a task

a black-backed wagtail (Motacilla alba lugens)