We don't have synonyms for rastas yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are rasta, rastus and raitas.
(n) :
a black youth subculture and religious movement that arose in the ghettos of kingston, jamaica, in the 1950s; rastafarians regard ras tafari as divine; males grow hair in long dreadlocks and wear woolen caps; use marijuana and listen to reggae music
(n) :
a black youth subculture and religious movement that arose in the ghettos of kingston, jamaica, in the 1950s; rastafarians regard ras tafari as divine; males grow hair in long dreadlocks and wear woolen caps; use marijuana and listen to reggae music