slip-on vs article of clothing

slip-on and article of clothing both are nouns.

Word	Noun	Adjective	Verb	Adverb
slip-on	Yes	No	No	No
article of clothing	Yes	No	No	No

As nouns, article of clothing is a hypernym of slip-on; that is, article of clothing is a word with a broader meaning than slip-on:

slip-on: an article of clothing (garment or shoe) that is easily slipped on or off
article of clothing: a covering designed to be worn on a person's body

Other hypernyms of slip-on include clothing, habiliment, vesture, wear, wearable.

slip-on (noun)	article of clothing (noun)
an article of clothing (garment or shoe) that is easily slipped on or off	a covering designed to be worn on a person's body