school of fishes=മത്സ്യങ്ങളുടെ കൂട്ടം
"Flock" is often used with birds, such as a "flock of birds."
"Pile" is used with items or objects that can be stacked or heaped(അടുക്കിവെക്കാനോ കൂമ്പാരമാക്കാനോ കഴിയുന്ന വസ്തുക്കൾ), such as a "pile of books" or a "pile of leaves."
"Bunch" is used with objects that can be grouped together or clustered, such as a "bunch of grapes" or a "bunch of flowers
