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).

Example Input: barium hydroxide
Example Output: two hydroxide anion

Example Input: germanium
Example Output: four valence electron

Example Input: deer mouse
Example Output:
underpart