belief, friendship, idea, infinity, justice, love, notion, peace, religion, romance
Abstract language are words that represent ideas, intangibles, and concepts. examples: beauty, truth.
Two examples of abstract nouns are:educationknowledgeSimilarly, the words "love" and "hate" are abstract nouns (and antonyms) for emotions, and "beauty" and "ugliness" are subjective terms that are abstractions.
Examples of abstract nouns are:friendshipmemoryopportunitypatience
If by 'invisible' you mean abstract nouns, words for things that can't be seen, heard, smelled, tasted, or touched, some examples are:attitudebeautycaredestinyeducationfriendshipgratitudehopeideajokekindnesslovemysteryneedopinionpeacequestreasonseasontrusturgevalueworryyearzeal
informative abstract
Some examples of abstract nouns for thoughts:thoughtsideasbeliefknowledgecuriositymemory
Examples of abstract nouns for positive qualities are:braverycarefriendshiphappinesshonestyhopekindnessknowledgelovepatiencetruthunderstanding
Examples of positive feeling abstract nouns are:carecheerfulnessdelightfriendshiphappinesshopejoypleasurerelaxationsatisfactiontrustwelcome
Examples of common abstract nouns:abilityboredomcharitydangeregofeargratitudehourintelligencejusticeknowledgelibertymoodneedopinionproblemquestionreasonseasontreasonurgevirtueworkyesterdayzeal
Examples of abstract nouns that start with A are:abilityabsolutionacrimonyadministrationagitationaidamendsamnestyangeranxietyarbitrationargumentartavariceaweawkwardness
The 'abstraction' nouns are called abstract or idea noun. Abstract nouns are words for things that are not experienced by the five senses; things that can't be seen, heard, smelled, tasted, or touched. Abstract nouns are words for things that are known, understood, or felt emotionally. Some examples are:ambitionbeautychallengedangereducationfeargratitudehappinessignorancejoyknowledgeluckmemorynonsenseopinionquestrumorseasontrusturgevaluewonderyesterdayzeal
Examples of words with the prefix "abs" are absolve, absorbed, absolute, and absence.