milliequivalent vs atomic mass

milliequivalent and atomic mass both are nouns.

Word	Noun	Adjective	Verb	Adverb
milliequivalent	Yes	No	No	No
atomic mass	Yes	No	No	No

As nouns, atomic mass is a hypernym of milliequivalent; that is, atomic mass is a word with a broader meaning than milliequivalent:

milliequivalent: one-thousandth of an equivalent
atomic mass: (chemistry) the mass of an atom of a chemical element expressed in atomic mass units

Other hypernyms of milliequivalent include atomic weight, relative atomic mass.

milliequivalent (noun)	atomic mass (noun)
one-thousandth of an equivalent	(chemistry) the mass of an atom of a chemical element expressed in atomic mass units