must
WordReference English Thesaurus © 2025
Sense: Verb: auxiliary indicating obligation
Synonyms:
should Collocations, have to, need to, ought to, have got to, be obliged to, be required to, have no choice
Sense: Noun: anything strongly recommended - preceded by 'a'
Synonyms:
requirement Collocations, necessity Collocations, essential Collocations, prerequisite, condition Collocations, requisite, de rigueur