Armenian Greek Phrygian(extinct) Messapic(extinct) Albanian Graeco-Albanian or Albano-Greek is a proposed Indo-European subfamily – in the broader linguistic family known as (Palaeo-)Balkanic Indo-European – of which the only surviving representatives are Albanian and Greek.
[1][2] Within the Palaeo-Balkan branch this IE subfamily is separated from Armenian.
[1][2] A remarkable PIE root that underwent in Albanian, Armenian, and Greek a common evolution and semantic shift in the post PIE period is PIE *mel-i(t)- 'honey', from which Albanian bletë, Armenian mełu, and Greek μέλισσα, 'bee' derived.
[4] Innovative creations of agricultural terms shared only between Albanian and Greek, such as *h₂(e)lbʰ-it- 'barley' and *spor-eh₂- 'seed', were formed from non-agricultural Proto-Indo-European roots through semantic changes to adapt them for agriculture.
[5] According to linguist Lucien van Beek – the author of the chapter "Greek" in the book The Indo-European Language Family by Thomas Olander (ed., 2022) – a number of potential Greek and Albanian common innovations adduced by Hyllested and Joseph in the chapter "Albanian" in the same book "can or must be dated later than Proto-Greek", concluding that he is "not convinced of a close genetic relation between Greek and Albanian".