Is wood a predicate noun

No, the noun 'wood' is not a standard collective noun. A collective noun is a Word used to group people or things taken together as one whole in a descriptive way. A collective noun is an informal part of speech.

The noun 'wood' as a Word for a substance derived from trees doesn't suit the function of a collective noun. The noun 'wood' as a Word for an area of land, smaller than a forest, that is covered with growing trees could be used as a collective noun in a limited way, for example a wood of birches or a wood of evergreens.