* necessary * vital * important
essential, compulsory, required, necessary, enforced, requisite, mandatory, binding
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.
A synonym for the word "sensor" is "detector".
No
life-sustaining, essential
essential, need, imperative
No, they are the opposite words.
needed, necessary, required
essential, central, key, primary, principal, cardinal
There are several: living, essential, biological or biotic.
Necessary, crucial, indispensable.
crucial, essential, key, significant, necessary
Synonyms for the word "imperative" are commanding, mandatory, essential, masterful.
essential, compulsory, required, necessary, enforced, requisite, mandatory, binding
This is your answer (synonyms of necessary below)essential, indispensableincumbentneeded, needful, required, requisiteobligatory