alluvial plain, coastal plain, delta, delta plain.
Plain, boring
just plain nervousness
fundamental simple plain ordinary
Its swampI think a better synonym is plain (extensive area of flat land). A swamp is a wet damp place, prairies or plain are not necessarily wet.
No, it is a synonym. Antonyms have opposite meanings.
plain (homophone for plane)
CHROMATIC:SYNONYM: colorful,flashy,brightANTONYM:dull,plain,boring
plain, sharp, unmistakable, well-defined, unique
very bad luck, plain distraught
Synonyms for steppe include grassland, plain, prairie, and savanna.
acres, agricultural region, alkali flat, alluvial plain