Mushroom.
A magnum is a large bottle, carboy's are another.
A very familiar member is the mushroom.
Sequoia
another word for very large
No. The confection called a truffle is made from chocolate, butter and sugar, and sometimes liqueur. Very yummy, but no fungus - the two simply share a common name.
A mansion.
Methusela
very close
A synonym for a very large area within a continent is a region.
behemoth
sounds like a promlem. is it gettng enough water? and signs of pests or fungus?
Another name that is very, very similar to the color of purple is violet.