makeweight vs physical object

makeweight and physical object both are nouns.

Word	Noun	Adjective	Verb	Adverb
makeweight	Yes	No	No	No
physical object	Yes	No	No	No

As nouns, physical object is a hypernym of makeweight; that is, physical object is a word with a broader meaning than makeweight:

makeweight: anything added to fill out a whole
physical object: a tangible and visible entity; an entity that can cast a shadow

Other hypernyms of makeweight include object.

makeweight (noun)	physical object (noun)
a weight added to the scale to reach a required weight	a tangible and visible entity; an entity that can cast a shadow
anything added to fill out a whole