According to Scrabulous ETAERIO is the most likely seven-letter word to get in Scrabble. It refers to an aggregate fruit, like a raspberry - which is actually lots of little fruits joined at their bases. Another likely word is TAENIAE - the plural of TAENIA which was an ancient Greek hairband.
Some other high-probability bingos containing five vowels, in order of likelihood, include:
AEOLIAN - relating to the wind (the image is of an aeolian harp - a harp played by the wind)
OLEARIA - daisy bush
AIERIES - eyries or eagles' nests
DOULEIA - veneration of saints in RC Church
AEONIAN - everlasting
AENEOUS - brass coloured or greenish-gold
AREOLAE - coloured rings around human nipples
AUREOLE - halo
ALIENEE - person to whom a transfer of property is made
EUGENIA - plant of the clove family
AEROBIA - organisms that require oxygen
AEOLIAN - relating to the wind (the image is of an aeolian harp - a harp played by the wind)
OLEARIA - daisy bush
AIERIES - eyries or eagles' nests
DOULEIA - veneration of saints in RC Church
AEONIAN - everlasting
AENEOUS - brass coloured or greenish-gold
AREOLAE - coloured rings around human nipples
AUREOLE - halo
ALIENEE - person to whom a transfer of property is made
EUGENIA - plant of the clove family
AEROBIA - organisms that require oxygen
Comments
AIERIES is in fact an allowable word in SOWPODS Scrabble - as is AERIES. Thank you for pointing this out!