centerfold vs foldout

centerfold and foldout both are nouns.

Word	Noun	Adjective	Verb	Adverb
centerfold	Yes	No	No	No
foldout	Yes	No	No	No

As nouns, foldout is a hypernym of centerfold; that is, foldout is a word with a broader meaning than centerfold:

centerfold: a magazine center spread; especially a foldout of a large photograph or map or other feature
foldout: an oversize page that is folded in to a book or magazine

Other hypernyms of centerfold include facing pages, spread, spread head, spreadhead, gatefold.

centerfold (noun)	foldout (noun)
a magazine center spread; especially a foldout of a large photograph or map or other feature	an oversize page that is folded in to a book or magazine