Avocado is a fruit, more specifically a berry- see below link
http://ucavo.ucr.edu/AvocadoWebSite%20folder/AvocadoWebSite/General/FruitBerry.html
If you mean acorn then no it's a nut that when planted becomes a tree :)
It is possible to roast an avocado seed but I would not recommend it. You can slice the nut up and place it in the oven on low heat for 5-10 minutes but even then the bitterness of the nut does not go away and keeping the nuts in the oven for any longer than 10-15 will unfortunately result in burnt nuts.
avocado is not popular in India. It is called avocado Only.
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How do avocado's reproduce
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AVOCADO
The Haas Avocado..........
An avocado is a fruit