in Japanese morphology, a type of apophony found in word-final form caused by derivational suffixes

understanding, comprehension / appreciation

exposure (condition of being exposed) / exposure (taking a photograph)

expose (to uncover, make visible, bring to daylight, introduce to) / expose (to subject photographic film to light thus ruining it or taking a picture if controlled)

the Japanese language

understand, comprehend / appreciate

importance, consequence, significance

important, significant

study, learn

studying, learning