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).

Ex Input:
barium hydroxide

Ex Output:
two hydroxide anion


Ex Input:
cavity

Ex Output:
muscle wall


Ex Input:
sea snake

Ex Output:

tail