bioacoustician

Etymology tree
Proto-Indo-European *gʷeyh₃-der.
Ancient Greek βῐ́ος (bĭ́os)
Ancient Greek βῐο- (bĭo-)der.
English bio-
Proto-Indo-European *h₂eḱ-
Proto-Indo-European *h₂ew-
Proto-Indo-European *-s
Proto-Indo-European *h₂ṓws
Proto-Indo-European *-yéti
Proto-Indo-European *h₂ḱh₂owsyéti
Proto-Hellenic *akóuhō
Ancient Greek ἀκούω (akoúō)
Proto-Indo-European *-kos
Ancient Greek -κός (-kós)
Ancient Greek -ῐκός (-ĭkós)
Ancient Greek ᾰ̓κουστῐκός (ăkoustĭkós)bor.
Medieval Latin acousticusbor.
English acoustic
Proto-Indo-European *-nós
Proto-Italic *-nos
Latin -nus
Latin -ānus
Latin -iānusbor.
English -ian
English acoustician
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English bio-
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English acoustic
English bioacoustic
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English -ian
English bioacoustician
From either bio- + acoustician or bioacoustic(s) + -ian.