Synonyms of rudiment
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fundamentalsThe fundamentals of something are its simplest, most important elements, ideas, or principles, in contrast to more complicated or detailed ones.
• teaching small children the fundamentals of road safety
basicslawsrulesprinciplesessentialscornerstonesaxiomsfirst principlesrudimentssine qua non
nuts and bolts
Thesaurus for rudiment from the Collins English Thesaurus