photodocumentary

Etymology tree
Proto-Indo-European *bʰeh₂-
Proto-Indo-European *bʰéh₂os
Proto-Hellenic *pʰáwos
Ancient Greek φᾰ́ος (phắos)
Ancient Greek φῶς (phôs)
Ancient Greek φωτο- (phōto-)der.
English photo-
Proto-Indo-European *deḱ-der.
Proto-Italic *dokeō
Latin doceō
Proto-Indo-European *-mn̥
Proto-Indo-European *-mn̥tom
Proto-Italic *-mentom
Latin -mentum
Latin documentumbor.
French document
Proto-Indo-European *-yósder.
Proto-Italic *-āzijos
Latin -āriusder.
French -aire
French documentairebor.
English documentary
English photodocumentary
From photo- + documentary.