is a specific kind of: angiospermous tree, flowering tree.

is a broader term that covers: Cola acuminata, goora nut, kola, kola nut, kola nut tree | macadamia, macadamia tree | hazel, hazelnut, hazelnut tree | walnut, walnut tree | hickory, hickory tree | Carya illinoensis, Carya illinoinsis, pecan, pecan tree | wing-nut, wing nut | Bertholletia excelsa, brazil-nut tree, brazil nut | Anacardium occidentale, cashew, cashew tree | pistachio, pistachio tree, Pistacia vera.