pizza vs anchovy pizza

pizza and anchovy pizza both are nouns.

Word	Noun	Adjective	Verb	Adverb
pizza	Yes	No	No	No
anchovy pizza	Yes	No	No	No

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

pizza: Italian open pie made of thin bread dough spread with a spiced mixture of e.g. tomato sauce and cheese
anchovy pizza: tomato and cheese pizza with anchovies

Other hyponyms of pizza include sausage pizza, pepperoni pizza, cheese pizza, Sicilian pizza.

pizza (noun)	anchovy pizza (noun)
Italian open pie made of thin bread dough spread with a spiced mixture of e.g. tomato sauce and cheese	tomato and cheese pizza with anchovies