feminine nominative/vocative singular of czarny

(occult, idiomatic) black magic / (idiomatic) black magic, rocket science (something incredibly complex and incomprehensible)

(astronomy) black hole

blackcurrant (shrub) / blackcurrant (fruit)

(informal) smallpox

(informal, idiomatic) cup of coffee / (informal, idiomatic) little black dress

(historical) a black Volga car that would supposedly cruise around cities and abduct children

(idiomatic) black sheep (person who is not wholesome)

(idiomatic) kompromat, discrediting documents

crowberry (Empetrum nigrum)