(4A. Thesaurus creator; ROOKIES (25D. First-year players), SAM I AM (38A. Last words of “Green Eggs and Ham”), and a SCAMP (61A. Rascal). Other — DIASPORA (11D. Scattering of an ethnic group)   and  EMBARKED (36D. Started out on, as a journey) bring to mind… Six-letter — DROVES (1D. Herds), EXERTS