Relevance ranks synonyms and suggests the best matches based on how closely a synonym’s sense matches the sense you selected.
Synonyms for hard hatnoun protective headgear
noun. person who is cautious, moderate; an opponent of change
noun. person(s) performing service
noun. person who is politically conservative
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.