Yes, the word 'concentrating' is an abstract noun, a gerund; a word for a mental process.
A gerund is the present participle of a verb used as a noun; the verb form ending with -ing.
A gerund can be a concrete or an abstract noun, for example:
concrete gerunds:
hammering
burning
writing
speaking
abstract gerunds:
thinking
hoping
fearing
concentrating
The noun 'noun' is an abstract noun, a word for a concept.
The abstract noun is announcement.
'Discovery' is an abstract noun.
Discussion is the abstract noun
Discussion is the abstract noun
Is cheer an abstract noun or a concrete 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.
Friendship has not abstract noun because It is a abstract noun
Abstract noun of hopeless
The abstract noun form is tourism.
The abstract noun for the adjective quick is quickness.
The abstract noun for the adjective vacant is vacantness. Another abstract noun form is vacancy.