Youth
A nine letter abstract noun that starts with U is ultimatum.
Examples of abstract nouns that start with A are:abilityabsolutionacrimonyadministrationagitationaidamendsamnestyangeranxietyarbitrationargumentartavariceaweawkwardness
The noun yellow starts with y- and ends with -w.
The abstract noun form of the verb to begin is the gerund, beginning.The noun 'beginning' is an abstract noun as a word for the point in time at which something starts; any form of time is a concept.The noun 'beginning' is a concrete noun as a word for the place that something starts; a word for a physical place.
Abstract nouns that start with X, Y, or Z are:xylographyyearyesterdayyieldyouthzealzealousnesszoologyzymurgy
The abstract noun form of the adjective slippery is slipperiness.The noun 'slipperiness' is an abstract noun as a word for a quality of evasiveness, unreliability, unpredictability; a word for a concept.The noun 'slipperiness' is a concrete noun as a word for a physical quality of smoothness, slickness, greasiness, oiliness, iciness, etc.Note that in making this noun form, the final y in slippery becomes an i. This is a very common pattern for adjectives that end in y and their corresponding noun forms, such as pretty/prettiness and heavy/heaviness.
year
Examples of nouns that start with Y are:yakyamyardyarnyawnyearyeastyellowyesterdayyogurtyokeyurt
Yes, the noun astonishment is an abstract noun, a word for an emotional reaction.
Yacht is a noun beginning with Y, yell is a verb, and young is an adjective.
Is undergone an abstract noun
Concrete noun