atomic mass vs eq

atomic mass and eq both are nouns.

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

As nouns, eq is a hyponym of atomic mass; that is, eq is a word with a more specific, narrower meaning than atomic mass:

atomic mass: (chemistry) the mass of an atom of a chemical element expressed in atomic mass units
eq: the atomic weight of an element that has the same combining capacity as a given weight of another element; the standard is 8 for oxygen

Other hyponyms of atomic mass include combining weight, equivalent, equivalent weight, meq, milliequivalent.

atomic mass (noun)	eq (noun)
(chemistry) the mass of an atom of a chemical element expressed in atomic mass units	the atomic weight of an element that has the same combining capacity as a given weight of another element; the standard is 8 for oxygen