Synonyms For "Essential" :

1 syllable:

must

2 syllables:

crucial, staple, vital

3 syllables:

important, intrinsic, of import, organic, primary, requirement, requisite, substantial, substantive, virtual

4 syllables:

biogenic, constituent, constitutive, intrinsical, necessary, necessity

5 syllables:

constitutional, indispensable, unexpendable