Eureka (word)
"Eureka" comes from the Ancient Greek word "heúrēka", meaning "I found (it)", which is the first person singular perfect indicative active of the verb "heuriskō" "I find". It is closely related to heuristic, which refers to experience-based techniques for problem solving, learning, and discovery.
Horilka
The word comes from the same root as the verb "hority", ‘to burn’, similarly to Belarusian "harelka", south Russian "gorelka", Czech "kořalka", and Slovak "goralka", "goržolka". It is considered to have come about following the Polish example "gorzałka", possibly as an abbreviation of a compound word like "horile vyno" (‘burning wine’; compare the older word "horěloe vyno", горѣлое вино, attested in 1511) or "horila(ya) voda" (‘burning water’; compare early Czech "pálená voda" → "pálenka" or Hungarian/Transylvanian "palinka"). It may be an adaptation of the early Old High German "der brannte Wein" → "Branntwein". Also compare English "brandy", short for "brandywine", from Dutch "brandewijn", ‘burning wine’.