Given an entity as input, output another entity which is part of the input entity. These are entities of meronym. In linguistics, meronymy is a semantic relation between a meronym denoting a part and a holonym denoting a whole. In simpler terms, a meronym (i.e., output entity) is in a part-of relationship with its holonym (i.e., input entity).

processor
pipeline
A processor is a part of the CPU that performs calculations and logic operations, so it is a meronym of CPU. A pipeline is also a part of the CPU that handles instructions sent to it by the processor. Therefore, pipeline is also a meronym of CPU..