element?
things, beings, individuals, objects, substances, creaturs, organisms
Generally chemical compound and substance are considered synonyms. But also a mixture is a substance.
"Assay", and "test" are potential synonyms for the word 'titrate'. The term is mainly used in the Chemistry to measure concentration of chemically active groups of substances such as acids and bases.
Synonyms for "spice" include "seasoning," "flavoring," "condiment," and "herb." These terms refer to substances used to enhance the taste or aroma of food. Depending on the context, "spice" can also imply excitement or interest, with synonyms like "zest" or "flair."
Compounds and substances are practically synonyms; a compound or substance may be impure (contain impurities) or pure ( the impurities are only as traces or absent).
They are synonyms.
Synonyms
Element has multiple meanings. There are no synonyms for the elements referring to those in the periodic table. When referring to parts of something, some synonyms like "components," "items," "ingredients," and "sections" can be used.
Relative and kin are synonyms.
They are synonyms.
synonyms
The synonyms for upon is on