Question

abstract noun of infant, priest, mother, friend, war, courageous, old, mother, child, father,care

Answer 1

ABSTRACT NOUNS ⇒

Infant - Infancy

 Priest - priesthood

Mother - motherhood 

Friend - friendship

War - war 

( War is itself abstract noun because it's no material and we can't touch it , It is name given to an act , So It'll be an abstract noun.)

Courageous - courageousness

Old -  oldage

Child - childhood 

Father - fatherhood 

Care - care 
(Care is also unmaterial , We can just feel it , we can't touch it or interact with it , So care itself is an abstract noun)

Answer 2

Infant - infancy

priest - priesthood

mother - motherhood

friend - friendship

war - war

courageous - courageousness

old - old age

child - childhood

father - fatherhood

care - careness