* necessary * vital * important
essential, compulsory, required, necessary, enforced, requisite, mandatory, binding
A synonym for "important" is "significant." Other alternatives include "crucial," "vital," and "essential," each conveying a sense of necessity or high value in various contexts.
A synonym for changable is adaptable.
A synonym for common noun is word.
A synonym for debris is garbage. An antonym for debris is cleanliness.
No
life-sustaining, essential
essential, need, imperative
Essential, vital, necessary.
needed, necessary, required
No, they are the opposite words.
needful, compulsory, vital, crucial
essential, central, key, primary, principal, cardinal
necessary, required, crucial
Synonyms for the word "imperative" are commanding, mandatory, essential, masterful.
crucial, essential, key, significant, necessary
essential, compulsory, required, necessary, enforced, requisite, mandatory, binding