<fish> cigarette butt 5 realizations
ACCEPTED Realization 1
Type Polysemy
Language English
Lexeme roach
Meaning 1 roach (Rutilus rutilus)
Direction
Meaning 2 the butt of a marijuana cigarette
Reference Merriam-Webster
Comment
ACCEPTED Realization 2
Type Polysemy
Language Modern Greek
Lexeme γόπα
Meaning 1 goby
Direction
Meaning 2 cigarette butt, stub of the cigarette
Reference Xorikov, Malev 1993: 225
Comment
ACCEPTED Realization 3
Type Polysemy
Language Russian
Lexeme бычок (byčok)
Meaning 1 goby
Direction
Meaning 2 cigarette butt, stub of the cigarette

Бычка! — подскочил один из братьев и, взяв окурок, роскошно и шумно вдувая воздух, наслаждаясь, затянулся. [Велимир Хлебников, Малиновая шашка (1921) ]

Reference
Comment The earliest mention in school folklore since 1912. Thus, the folk etymology from Belomorkanal (BK) mark of cigarettes is obviously false. 
ACCEPTED Realization 4
Type Polysemy
Language Turkish
Lexeme izmarit
Meaning 1 sea bream (Spicara smaris)
Direction
Meaning 2 cigarette butt, stub of the cigarette
Reference Baskakov 1977: 489
Comment
ACCEPTED Realization 5
Type Polysemy
Language Turkish
Lexeme kefal
Meaning 1 Mugil cephalus
Direction
Meaning 2 cigarette butt (argo)
Reference Baskakov 1977: 529
Comment