different between geochronometry vs geochronometer

English

geo- +? chrono- +? -metry

geochronometry (usually uncountable, plural geochronometries)

(geology) the science of the measurement of the age of rocks etc. based on the radioactive decay of naturally occurring isotopes

geo- +? chronometer

geochronometer (plural geochronometers)

(geology) Any device used to measure geologic time, especially by measuring radioactive decay, or the relative abundance of isotopes

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