As adjectives the difference between photometric and phonometric
is that photometric is of or relating to photometry or to photometers while phonometric is pertaining to the measurement of sound.
photometric
English
Adjective
(-)
Of or relating to photometry or to photometers.
(of leaves) Adjusting position with respect to light.
phonometric
English
Adjective
(-)
Pertaining to the measurement of sound.