loungewear vs lounger

loungewear and lounger both are nouns.

Word	Noun	Adjective	Verb	Adverb
loungewear	Yes	No	No	No
lounger	Yes	No	No	No

As nouns, lounger is a hyponym of loungewear; that is, lounger is a word with a more specific, narrower meaning than loungewear:

Other hyponyms of loungewear include lounging jacket, smoking jacket, lounging pajama, lounging pyjama.

loungewear (noun)	lounger (noun)
clothing suitable for relaxation	an armchair whose back can be lowered and foot can be raised to allow the sitter to recline in it
	an article of clothing designed for comfort and leisure wear
	someone who wastes time