must

nouns

a necessary or essential thing
"seat belts are an absolute must"
is a type of (narrower)
anything indispensable
"food and shelter are necessities of life"; "the essentials of the good life"; "allow farmers to buy their requirements under favorable conditions"; "a place where the requisites of water fuel and fodder can be obtained"
grape juice before or during fermentation
is a type of (narrower)
the juice of grapes
the quality of smelling or tasting old or stale or mouldy
is derived from
is derived from

adjectives

highly recommended
"a book that is must reading"
is similar to
basic and fundamental
"the essential feature"