Synonyms for Deck chair:

n.

brolly, chaise, parasol, lounger, chaise lounge, chaise longue. chair (noun)
throne, armchair, straight chair, lawn chair, swivel chair, stool, hassock, chair, ottoman, pew, saddle, seat, bucket seat, sofa, rumble seat, campstool, bench, rocker, bar stool, recliner, dining chair, lounge chair, sedan chair, furniture, swing.
deck chair (noun)
beach chair.
folding chair (noun)
beach chair.

Other synonyms:

parasol, brolly, lounger. chaise longue. Other relevant words:
beach chair.