1.  junky(n = noun.person) drug addict, junkie - a narcotics addict;
is a kind of addict
has particulars: cocaine addict, binger, crack addict, heroin addict, opium addict, opium taker, withdrawer

2.  junky(n = noun.person) addict, freak, junkie, nut - someone who is so ardently devoted to something that it resembles an addiction; "a golf addict"; "a car nut"; "a bodybuilding freak"; "a news junkie"
is a kind of enthusiast, partisan, partizan
has particulars: gym rat