I have never used to term "lounge" to refer to a piece of furniture -- with one, specific exception: a "chaise lounge," which is like a sofa or couch but it has cushions at one end and is intended for reclining on.
I use the term "couch" as a more general term, and "sofa" is a couch with especially thick, cushy cushions.
But, that may just be me.
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