1
SearchWP Included
Synonym rules in Global Rules (single words); keyword stemming also included.
95feature score
WordPress Search Plugins with Synonyms & stemming
Treats related words and word forms as matches. 8 of the 8 plugins we track include it.
2
Ajax Search Lite Paid version Pro
Pro synonym lists (index table engine), with AI synonym suggestions from Search AI.
84feature score
3
Relevanssi Included
Synonym settings in the free version; Premium adds English stemming.
82feature score
4
ElasticPress Included
Synonyms dashboard supports synonym sets, replacements and hyponyms.
88feature score
5
WP Search with Algolia Included
Synonyms are set up in the Algolia dashboard; AI synonyms need Algolia Grow Plus.
84feature score
6
FiboSearch – Ajax Search for WooCommerce Paid version Pro
Synonym lists are a Pro feature.
64feature score
7
Ivory Search Included
Free synonym list; keyword stemming requires Pro Plus.
61feature score
8
Jetpack Search Partial
Language analysis matches word forms in 38 languages; no custom synonym lists.
57feature score