fluent vs silver-tongued

fluent and silver-tongued both are adjectives.

Word	Noun	Adjective	Verb	Adverb
fluent	No	Yes	No	No
silver-tongued	No	Yes	No	No

As adjectives, fluent and silver-tongued are synonyms defined as:

fluent and silver-tongued: expressing yourself readily, clearly, effectively

Other synonyms of fluent include eloquent, facile, silver, smooth-spoken.

fluent (adjective)	silver-tongued (adjective)
expressing yourself readily, clearly, effectively	expressing yourself readily, clearly, effectively
smooth and unconstrained in movement