In order for a noun to be semantically bounded, its referent item, whether tangible or abstract, must have clearly defined limits on the extent and content of what it encompasses. Structurally, bounded and unbounded nouns correlate to a number of descriptive criteria. The first criterion is internal homogeneity; while the referent of bounded nouns can be composed of distinct segments, an unbounded noun typically refers to something which is considered a cohesive expanse.