Genetic networks vs genetic architectures?
You can think of a genetic network as a network of interacting genes, turning each other on and off based on complex relationships and external stimuli. A genetic network is typically characterized in terms of graph theory--connectivity, density, etc.

The term genetic architecture, on the other hand, typically refers to a trait or phenotype and the characteristics of the gene(s) that contribute to that phenotype (this is what the Wikipedia article means by genotype-phenotype mapping). Characterization of a phenotype's genetic architecture involves describing how the phenotype(s) is/are related to the genotype(s). For example, for a particular trait or set of traits, is there a one-to-one relationship between gene and trait? Or do multiple genes contribute to a single trait? Or are multiple traits affected by changes in a single gene? The relevant terminology is discussed briefly in the Wikipedia article: polygeny, pleiotropy, etc.