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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

matter go
that which has mass and occupies space

substance go
the real physical matter of which a person or thing consists

mixture go
(chemistry) a substance consisting of two or more substances mixed together (not in fixed proportions and not with chemical bonding)

alloy, metal go
a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten

solder
an alloy (usually of lead and tin) used when melted to join two metal surfaces

noun.substance

3 Subcategories

hard solder go
solder that contains copper
silver solder go
a solder that contains silver
soft solder go
solder that melts at a relatively low temperature