26,102words currently have published synonym-style alternatives
90,593searchable synonym connections
350,924published thesaurus relationships of every type
Start with the meaning
Violoncello
A stringed instrument of music; a bass viol of four strings, or a bass violin with long, large strings, giving sounds an octave lower than the viola, or tenor or alto violin.
Open English WordNet places these words in at least one shared synset. They share a lexicalised sense, but context, register and collocation should still be checked before substitution.