topping vs meringue

topping and meringue both are nouns.

Word	Noun	Adjective	Verb	Adverb
topping	Yes	Yes	No	No
meringue	Yes	No	No	No

As nouns, meringue is a hyponym of topping; that is, meringue is a word with a more specific, narrower meaning than topping:

topping: a flavorful addition on top of a dish
meringue: sweet topping especially for pies made of beaten egg whites and sugar

Other hyponyms of topping include frosting, ice, icing, glaze, whipped cream, streusel.

topping (noun)	meringue (noun)
a flavorful addition on top of a dish	sweet topping especially for pies made of beaten egg whites and sugar

topping (adjective)	meringue (adjective)
excellent; best possible