trade-in vs belongings

trade-in and belongings both are nouns.

Word	Noun	Adjective	Verb	Adverb
trade-in	Yes	No	No	No
belongings	Yes	No	No	No

As nouns, belongings is a hypernym of trade-in; that is, belongings is a word with a broader meaning than trade-in:

trade-in: an item of property that is given in part payment for a new one
belongings: something owned; any tangible or intangible possession that is owned by someone

Other hypernyms of trade-in include holding, property.

trade-in (noun)	belongings (noun)
an item of property that is given in part payment for a new one	something owned; any tangible or intangible possession that is owned by someone