Below are possible answers for the crossword clue Key.
7 letter answer(s) to key
CENTRAL
a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication
in or near a center or constituting a center; the inner area; "a central position"
middle
serving as an essential component;
CRUCIAL
having crucial relevance; "crucial to the case"; "relevant testimony"
of extreme importance; vital to the resolution of a crisis; "a crucial moment in his career"; "a crucial election"; "a crucial issue for women"
of the greatest importance; "the all-important subject of disarmament"; "crucial information"; "in chess cool nerves are of the essence"
vital
8 letter answer(s) to key
CRUCIBLE
a vessel made of material that does not melt easily; used for high temperature chemical reactions
9 letter answer(s) to key
ESSENTIAL
absolutely necessary; vitally necessary; "essential tools and materials"; "funds essential to the completion of the project"; "an indispensable worker"
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"
basic and fundamental; "the essential feature"
being or relating to or containing the essence of a plant etc; "essential oil"
defining rights and duties as opposed to giving the rules by which rights and duties are established; "substantive law"
of the greatest importance; "the all-important subject of disarmament"; "crucial information"; "in chess cool nerves are of the essence"
OPERATIVE
(of e.g. a machine) performing or capable of performing; "in running (or working) order"; "a functional set of brakes"
a person secretly employed in espionage for a government
being in force or having or exerting force; "operative regulations"; "the major tendencies operative in the American political system"
effective; producing a desired effect; "the operative word"
relating to or requiring or amenable to treatment by surgery especially as opposed to medicine; "a surgical appendix"; "a surgical procedure"; "operative dentistry"
someone who can be employed as a detective to collect information
4 letter answer(s) to key
ISLE
a small island
5 letter answer(s) to key
ISLET
a small island
VITAL
Critical
Essential to maintain life
full of spirit;
manifesting or characteristic of life; "a vital, living organism"; "vital signs"
Necessary
performing an essential function in the living body; "vital organs"; "blood and other vital fluids"; "the loss of vital heat in shock"; "a vital spot"; "life-giving love and praise"
urgently needed; absolutely necessary; "a critical element of the plan"; "critical medical supplies"; "vital for a healthy society"; "of vital interest"
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