staple

[1]	basic
[2]	staple fiber , staple fibre
[3]	raw material , staples , necessities , essentials , basics , fundamentals

adj.

[1]	basic , elementary , essential , necessary , requisite , required , vital , indispensable , critical , fundamental , primary , principal , main , chief
[2]	standard , usual , habitual , ordinary , customary , prevailing , normal , conventional , universal