flatware vs silverware

flatware and silverware both are nouns.

Word	Noun	Adjective	Verb	Adverb
flatware	Yes	No	No	No
silverware	Yes	No	No	No

As nouns, silverware is a hypernym of flatware; that is, silverware is a word with a broader meaning than flatware:

flatware: silverware eating utensils
silverware: tableware made of silver or silver plate or pewter or stainless steel

flatware (noun)	silverware (noun)
silverware eating utensils	tableware made of silver or silver plate or pewter or stainless steel
tableware that is relatively flat and fashioned as a single piece