Given two entities as input, classify as "yes" if second entity is the part of the first entity. Otherwise classify them as "no". 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., second entity) is in a part-of relationship with its holonym (i.e., first entity).

Entity 1: largemouths 
 Entity 2: sperm
yes

Entity 1: embryo 
 Entity 2: pouch
yes

Entity 1: swimmer 
 Entity 2: gill

yes