Synonyms for Lounge chair:

n.

chair (noun)
deck chair, armchair, rocker, swivel chair, throne, rumble seat, recliner, bench, hassock, straight chair, stool, furniture, seat, lawn chair, ottoman, pew, bucket seat, sofa, bar stool, chair, campstool, sedan chair, swing, dining chair, saddle.
easy chair (noun)
overstuffed chair.
lounge chair (noun)
overstuffed chair, easy chair.

Other synonyms:

easy-chair
easy chair.
Other relevant words:
overstuffed chair.