Pre-Greek substrate
The Pre-Greek substrate (or Pre-Greek substratum) consists of the unknown language or languages spoken in prehistoric Greece before the settlement of Proto-Greek speakers in the area. It is possible that Greek took over some thousand words and proper names from such a language (or languages), because some of its vocabulary cannot be satisfactorily explained as deriving from the Proto-Greek language.
Pre-Greek loanwords
There are different categories of Pre-Greek, or "Aegean", loanwords such as:
Animals: e.g. βόλινθος/βόνασσος, 'wild ox'; κάνθαρος, 'beetle'; σμίνθος, 'mouse'.
Architecture: e.g. λαβύρινθος, 'labyrinth'; πλίνθος, 'brick'; πύργος, pyrgos, 'tower'.
Maritime Vocabulary: e.g. θάλασσα, 'thálassa', 'sea'.
Musical Instruments: e.g. σύριγξ, 'flute'; κίθαρις, 'kitharis', 'guitar'; σάλπιγξ, 'trumpet'; φόρμιγξ, 'lyre'.
Personal Names: e.g. Ὀδυσσεύς, 'Odysseus'.
Plants: e.g. ἐλαία, 'elaia', 'olive tree'; κισσός, 'kissos', 'ivy'; ἄμπελος, 'ampelos', 'vine'.
Metals and Metallurgy: κασσίτερος, 'kassiteros', 'tin'; χαλκός, 'chalkos', 'bronze'; μόλυβός, 'molybos', 'lead'; σίδηρος, 'sideros', 'iron'.