lightning rod (noun) lightning rod: protection from lightning strike
Sinonime: capital,
cardinal,
chief, constitutive,
crucial,
foremost,
fundamental,
imperative,
indispensable,
leading,
main, necessary, necessitous, needed, needful,
prerequisite,
principal,
required,
requisite, right-hand,
wantedAntonime: accessory,
auxiliary, inessential,
minor, nonessential,
secondary,
subsidiary,
unimportant