Abstract nouns are sometimes referred to as special nouns. Abstract nouns are words for things that can't be experienced by any of the five senses; they can't be seen, heard, smelled, tasted, or touched. Abstract nouns are things that are known, learned, understood, believed, or felt emotionally.
Examples are:assumption
attitude
belief
charm
conclusion
danger
decision
economics
emotion
enjoyment
fear
freedom
generosity
gratitude
happiness
hope
ignorance
intelligence
jealousy
joy
kismet
knowledge
liberty
love
luck
mathematics
memory
moment
news
notion
omission
opinion
peace
physics
plot
politics
question
reason
rest
rumor
science
season
sorrow
time
trauma
trouble
understanding
urgency
valor
value
wealth
wisdom
year
youth
zeal