Head noun: feast
Postmodifier: of unleavened bread

Same concepts
http://dbpedia.org/resource/Passover

Broader concepts

labelprovenanceconfidence
agricultural festivalisap:2973292400.562790
feastisap:3661363210.376699
typeisap:2058179690.313066
dayisap:3260147770.280321
thingisap:3726606080.205377

Narrower concepts

labelprovenanceconfidence
passoverisap:3641932160.298141