Bushes is another word for "shrubs."
Specifically, bushes and shrubs are characterized by a branching growth which tends to make their width about equivalent to their height. But taller shrubs also are called small trees. In fact, the cutting off point is 30 feet (9.144 meters), with tall shrubs and small trees maturing to maximum heights just under that figure.
Shrub is a noun.
Yes, the noun astonishment is an abstract noun, a word for an emotional reaction.
Is undergone an abstract noun
Concrete noun
The abstract noun is criticism.
The noun 'hopefulness' is an abstract noun, a word for an emotion.
The abstract noun is obligation.
Abstract noun of hopeless
Friendship has not abstract noun because It is a abstract noun
The abstract noun form is tourism.
The abstract noun for the adjective vacant is vacantness. Another abstract noun form is vacancy.
The abstract noun for the adjective quick is quickness.