- iceberg, berg - a large mass of ice floating at sea; usually broken off of a polar glacier
--1 is a kind of ice mass; floater
--1 has particulars: growler - crisphead lettuce, iceberg lettuce, iceberg - lettuce with crisp tightly packed light-green leaves in a firm head; "iceberg is still the most popular lettuce"
--2 is a kind of lettuce
--2 is a part of head lettuce, Lactuca sativa capitata